#!/usr/bin/perl -w
#------------------------------------------------------------------------------
# File:         exiftool
#
# Description:  Read/write meta information
#
# Revisions:    Nov. 12/03 - P. Harvey Created
#               (See html/history.html for revision history)
#
# References:   ATV - Alexander Vonk, private communication
#------------------------------------------------------------------------------
use strict;
require 5.004;

my $version = '8.15';

# add our 'lib' directory to the include list BEFORE 'use Image::ExifTool'
my $exeDir;
BEGIN {
    # get exe directory
    $exeDir = ($0 =~ /(.*)[\\\/]/) ? $1 : '.';
    # add lib directory at start of include path
    unshift @INC, "$exeDir/lib";
    # disable config file if specified
    if (@ARGV and lc($ARGV[0]) eq '-config') {
        shift;
        $Image::ExifTool::configFile = shift;
    }
}
use Image::ExifTool qw{:Public};

sub SigInt();
sub Cleanup();
sub CleanXML($);
sub EncodeXML($);
sub FormatXML($$$);
sub EscapeJSON($;$);
sub PrintJSON($$$);
sub GetImageInfo($$);
sub SetImageInfo($$);
sub DoSetFromFile($$$);
sub CleanFilename($);
sub ProcessFiles($;$);
sub ScanDir($$;$);
sub LoadPrintFormat($);
sub FilenameSPrintf($;$);
sub NextUnusedFilename($;$);
sub CreateDirectory($);
sub SourceFile($);
sub OpenOutputFile($);
sub AcceptFile($);
sub SlurpFile($$);
sub PrintTagList($@);
sub PrintErrors($$$);

# do cleanup on Ctrl-C
$SIG{INT} = 'SigInt';

END {
    Cleanup();
}

# declare all static variables
my @commonArgs;     # arguments common to all commands
my @dynamicFiles;   # list of -tagsFromFile files with dynamic names
my @dynamicValues;  # list of -TAG<=FMT pairs for setting new values
my @exclude;        # list of excluded tags
my @files;          # list of files and directories to scan
my @fileOrder;      # tags to use for ordering of input files
my @ignore;         # directory names to ignore
my @newValues;      # list of new tag values to set
my @tags;           # list of tags to extract
my %excludeGrp;     # hash of tags excluded by group
my %filterExt;      # lookup for filtered extensions
my %printFmt;       # the contents of the print format file
my %setTags;        # hash of list references for tags to set from files
my %warnedOnce;     # lookup for once-only warnings
my $addGeotime;     # automatically added geotime argument
my $allGroup;       # show group name for all tags
my $allInGroup;     # flag to show all tags in a group
my $binaryOutput;   # flag for binary output
my $binaryStdout;   # flag set if we output binary to stdout
my $comma;          # flag set if we need a comma in JSON output
my $condition;      # conditional processing of files
my $count;          # count of files scanned
my $countBad;       # count of files with errors
my $countBadCr;     # count files not created due to errors
my $countBadWr;     # count write errors
my $countCreated;   # count output files created
my $countDir;       # count of directories scanned
my $countFailed;    # count files that failed condition
my $countGoodCr;    # count files created OK
my $countGoodWr;    # count files written OK
my $countNewDir;    # count of directories created
my $countSameWr;    # count files written OK but not changed
my $countCopyWr;    # count of files copied without being changed
my $disableOutput;  # flag to disable normal output
my $doGlob;         # flag set to do filename wildcard expansion
my $doSetFileName;  # flag set if FileName may be written
my $doUnzip;        # flag to extract info from .gz and .bz2 files
my $escapeHTML;     # flag to escape printed values for html
my $escapeXML;      # flag to escape printed values for xml
my $evalWarning;    # warning from eval
my $fileHeader;     # header to print to output file (or console, once)
my $fileTrailer;    # trailer for output file
my $filtered;       # flag indicating file was filtered by name
my $filterFlag;     # file filter flag (0x01=deny extensions, 0x02=allow extensions)
my $fixLen;         # flag to fix description lengths when writing alternate languages
my $forcePrint;     # force printing of tags whose values weren't found
my $helped;         # flag to avoid printing help if no tags specified
my $html;           # flag for html-formatted output (2=html dump)
my $isWriting;      # flag set if we are writing tags
my $joinLists;      # flag set to join list values into a single string
my $json;           # flag for JSON-formatted output
my $listSep;        # list item separator (', ' by default)
my $mainTool;       # main ExifTool object
my $multiFile;      # non-zero if we are scanning multiple files
my $outFormat;      # -1=Canon format, 0=same-line, 1=tag names, 2=values only
my $outOpt;         # output file or directory name
my $outputExt;      # extension for output file (or undef for no output)
my $overwriteOrig;  # flag to overwrite original file
my $pause;          # pause before returning
my $preserveTime;   # flag to preserve times of updated files
my $quiet;          # flag to disable printing of informational messages / warnings
my $recurse;        # recurse into subdirectories
my $rtnVal;         # command return value (0=success)
my $scanWritable;   # flag to process only writable file types
my $seqFileNum;     # sequential file number used for %C
my $setTagsFile;    # filename for last TagsFromFile option
my $showGroup;      # number of group to show (may be zero or '')
my $showTagID;      # non-zero to show tag ID's
my $srcFmt;         # source file name format string
my $structOpt;      # output structured XMP information (JSON and XML output only)
my $tabFormat;      # non-zero for tab output format
my $tmpFile;        # temporary file to delete on exit
my $tmpText;        # temporary text file
my $validFile;      # flag indicating we processed a valid file
my $verbose;        # verbose setting
my $utf8;           # flag set if we are using UTF-8 encoding
my $useMWG;         # flag set if we are using any MWG tag
my $xml;            # flag for XML-formatted output

# lookup for O/S names which may use a backslash as a directory separator
# (ref File::Spec of PathTools-3.2701)
my %hasBackslash = ( MSWin32 => 1, os2 => 1, dos => 1, NetWare => 1, symbian => 1, cygwin => 1 );

# lookup for JSON characters that we escape specially
my %jsonChar = ( '"'=>'"', '\\'=>'\\', "\t"=>'t', "\n"=>'n', "\r"=>'r' );

# exit routine
sub Exit {
    if ($pause) {
        if (eval 'require Term::ReadKey') {
            print STDERR "-- press any key --";
            Term::ReadKey::ReadMode('cbreak');
            Term::ReadKey::ReadKey(0);
            print STDERR "\b \b" x 20;
        } else {
            print STDERR "-- press RETURN --\n";
            <STDIN>;
        }
    }
    exit shift;
}
# my warn and die routines
sub Warn { warn(@_) if $quiet < 2 or $_[0] =~ /^Error/; }
sub Die  { Warn @_; Exit 1; }
sub WarnOnce($) {
    Warn(@_) and $warnedOnce{$_[0]} = 1 unless $warnedOnce{$_[0]};
}

# define signal handlers and cleanup routine
sub SigInt()  { Cleanup(); exit 1; }
sub Cleanup() {
    unlink $tmpFile if defined $tmpFile;
    unlink $tmpText if defined $tmpText;
}

#------------------------------------------------------------------------------
# main script
#

# separate arguments common to all commands
if (grep /^-common_args$/i, @ARGV) {
    my (@newArgs, $common);
    foreach (@ARGV) {
        if (/^-common_args$/i) {
            $common = 1;
            next;
        } elsif ($common) {
            push @commonArgs, $_;
        }
        push @newArgs, $_;
    }
    @ARGV = @newArgs;
}

# loop over sets of command-line arguments separated by "-execute"
Command: while (@ARGV or not defined $rtnVal)
{

$rtnVal = 0 unless defined $rtnVal;

# initialize all static variables
# (not done: @commonArgs, $helped, $mainTool, $pause, $rtnVal)
undef @dynamicFiles;
undef @dynamicValues;
undef @exclude;
undef @files;
undef @fileOrder;
undef @ignore;
undef @newValues;
undef @tags;
undef %excludeGrp;
undef %filterExt;
undef %printFmt;
undef %setTags;
undef %warnedOnce;
undef $addGeotime;
undef $allGroup;
undef $allInGroup;
undef $binaryOutput;
undef $binaryStdout;
undef $comma;
undef $condition;
undef $disableOutput;
undef $doGlob;
undef $doSetFileName;
undef $doUnzip;
undef $escapeHTML;
undef $escapeXML;
undef $evalWarning;
undef $fileHeader;
undef $fileTrailer;
undef $filtered;
undef $fixLen;
undef $forcePrint;
undef $joinLists;
undef $multiFile;
undef $outOpt;
undef $outputExt;
undef $preserveTime;
undef $recurse;
undef $scanWritable;
undef $setTagsFile;
undef $showGroup;
undef $showTagID;
undef $srcFmt;
undef $structOpt;
undef $tmpFile;
undef $tmpText;
undef $useMWG;
undef $validFile;
undef $verbose;

$count = 0;
$countBad = 0;
$countBadCr = 0;
$countBadWr = 0;
$countCreated = 0;
$countDir = 0;
$countFailed = 0;
$countGoodCr = 0;
$countGoodWr = 0;
$countNewDir = 0;
$countSameWr = 0;
$countCopyWr = 0;
$filterFlag = 0;
$html = 0;
$isWriting = 0;
$json = 0;
$listSep = ', ';
$outFormat = 0;
$overwriteOrig = 0;
$quiet = 0;
$seqFileNum = 0;
$tabFormat = 0;
$utf8 = 1;
$xml = 0;

# for Windows, use globbing for wildcard expansion if available - MK/20061010
if ($^O eq 'MSWin32' and eval "require File::Glob") {
    # override the core glob forcing case insensitivity
    import File::Glob qw(:globally :nocase);
    $doGlob = 1;
}

$mainTool = new Image::ExifTool;        # create ExifTool object

# don't extract duplicates by default unless set by UserDefined::Options
$mainTool->Options(Duplicates => 0) unless %Image::ExifTool::UserDefined::Options
    and defined $Image::ExifTool::UserDefined::Options{Duplicates};

# local variables
my ($doneCommonArgs, @nextPass);
my $pass = 0;

# parse command-line options in 2 passes...
# pass 1: set all of our ExifTool options
# pass 2: print all of our help and informational output (-list, -ver, etc)
for (;;) {
  if (not @ARGV) {
    if ($pass == 0) {
        # require MWG module if used in any argument
        $useMWG = 1 if not $useMWG and grep /^mwg:/i, @tags; # (also covers -p option)
        require Image::ExifTool::MWG if $useMWG;
    }
    last unless @nextPass;
    # process arguments which were deferred to the next pass
    @ARGV = @nextPass;
    undef @nextPass;
    ++$pass;
  }
  $_ = shift;
  if (s/^-//) {
    my $a = lc $_;
    if (/^list(w|f|wf|d|g(\d*)|x)?$/i) {
        $pass or push(@nextPass,"-$_");
        my $type = lc($1 || '');
        if (not $type or $type eq 'w' or $type eq 'x') {
            my $group;
            if ($ARGV[0] and $ARGV[0] =~ /^-(.+):(all|\*)$/i) {
                if ($pass == 0) {
                    $useMWG = 1 if lc($1) eq 'mwg';
                    push(@nextPass, shift);
                    next;
                }
                $group = $1;
                shift;
                $group =~ /IFD/i and Warn("Can't list tags for specific IFD\n"), next;
                $group =~ /^(all|\*)$/ and undef $group;
            } else {
                $pass or next;
            }
            $helped = 1;
            if ($type eq 'x') {
                require Image::ExifTool::TagInfoXML;
                my %opts;
                $opts{Flags} = 1 if $forcePrint;
                $opts{NoDesc} = 1 if $outFormat > 0;
                Image::ExifTool::TagInfoXML::Write(undef, $group, %opts);
                next;
            }
            my $wr = ($type eq 'w');
            my $msg = ($wr ? 'Writable' : 'Available') . ($group ? " $group" : '') . ' tags';
            PrintTagList($msg, $wr ? GetWritableTags($group) : GetAllTags($group));
            # also print shortcuts if listing all tags
            next if $group or $wr;
            my @tagList = GetShortcuts();
            PrintTagList('Command-line shortcuts', @tagList) if @tagList;
            next;
        }
        $pass or next;
        $helped = 1;
        if ($type eq 'wf') {
            my @wf;
            CanWrite($_) and push @wf, $_ foreach GetFileType();
            PrintTagList('Writable file extensions', @wf);
        } elsif ($type eq 'f') {
            PrintTagList('Recognized file extensions', GetFileType());
        } elsif ($type eq 'd') {
            PrintTagList('Deletable groups', GetDeleteGroups());
        } else { # 'g(\d*)'
            # list all groups in specified family
            my $family = $2 || 0;
            PrintTagList("Groups in family $family", GetAllGroups($family));
        }
        next;
    }
    if ($a eq 'ver') {
        $pass or push(@nextPass,'-ver'), next;
        my $libVer = $Image::ExifTool::VERSION;
        my $str = $libVer eq $version ? '' : " [Warning: Library version is $libVer]";
        print("$version$str$Image::ExifTool::RELEASE\n");
        $helped = 1;
        next;
    }
    if (/^(all|add)?tagsfromfile(=.*)?$/i) {
        $setTagsFile = $2 ? substr($2,1) : (@ARGV ? shift : '');
        $setTagsFile eq '' and Die "File must be specified for -tagsFromFile option\n";
        push(@newValues, "TagsFromFile=$setTagsFile");
        $setTags{$setTagsFile} or $setTags{$setTagsFile} = [];
        push @{$setTags{$setTagsFile}}, { Replace => ($1 and lc($1) eq 'add') ? 0 : 1 };
        next;
    }
    if ($a eq '@') {
        my $argFile = shift or Die "Expecting filename for -\@ option\n";
        unless (open(ARGFILE, "<$argFile")) {
            unless ($argFile !~ /^\// and open(ARGFILE, "<$exeDir/$argFile")) {
                Die "Error opening arg file $argFile\n";
            }
        }
        my (@newArgs, $didBOM);
        foreach (<ARGFILE>) {
            # filter Byte Order Mark if it exists from start of UTF-8 text file
            unless ($didBOM) {
                s/^\xef\xbb\xbf//;
                $didBOM = 1;
            }
            s/^\s+//; s/\s+$//s; # remove leading/trailing white space
            # remove white space before, and single space after '=', '+=', '-=' or '<='
            s/^([-\w]+)\s*([-+<]?=) ?/$1$2/;
            push @newArgs, $_ unless $_ eq '' or /^#/;
        }
        close(ARGFILE);
        unshift @ARGV, @newArgs;
        next;
    }
    /^(-?)(a|duplicates)$/i and $mainTool->Options(Duplicates => ($1 ? 0 : 1)), next;
    /^b(inary)?$/i and $mainTool->Options(Binary => 1), $binaryOutput = 1,  next;
    /^c(oordFormat)?$/i and $mainTool->Options('CoordFormat', shift || Die "Expecting coordinate format for -c option\n"), next;
    if ($a eq 'charset') {
        my $charset = (@ARGV and $ARGV[0] !~ /^-/) ? shift : undef;
        if (not $charset or $charset =~ /=$/) {
            $pass or push(@nextPass, '-charset'), next;
            my %charsets;
            $charsets{$_} = 1 foreach values %Image::ExifTool::charsetName;
            PrintTagList('Available character sets', sort keys %charsets);
            $helped = 1;
        } elsif ($charset !~ s/^(\w+)=// or lc($1) eq 'exiftool') {
            $mainTool->Options(Charset => $charset);
            $utf8 = ($mainTool->Options('Charset') eq 'UTF8');
        } elsif (lc($1) eq 'iptc') {
            $mainTool->Options(CharsetIPTC => $charset);
        } elsif (lc($1) eq 'id3') {
            $mainTool->Options(CharsetID3 => $charset);
        } else {
            warn "Unknown type for -charset option: $1\n";
        }
        next;
    }
    /^config$/i and Warn("Ignored -config option (not first on command line)\n"), shift, next;
    (/^d$/ or $a eq 'dateformat') and $mainTool->Options('DateFormat', shift || Die "Expecting date format for -d option\n"), next;
    (/^D$/ or $a eq 'decimal') and $showTagID = 'D', next;
    (/^e$/ or $a eq '-composite') and $mainTool->Options(Composite => 0), next;
    (/^-e$/ or $a eq 'composite') and $mainTool->Options(Composite => 1), next;
    (/^E$/ or $a eq 'escapehtml') and require Image::ExifTool::HTML and $escapeHTML = 1, next;
    ($a eq 'ex' or $a eq 'escapexml') and $escapeXML = 1, next;
    if ($a eq 'echo') { # undocumented debugging option
        unless ($pass) {
            push @nextPass, '-echo';
            push @nextPass, shift if @ARGV;
            next;
        }
        print(shift,"\n") if @ARGV;
        $helped = 1;
        next;
    }
    if (/^(ee|extractembedded)$/i) {
        $mainTool->Options(ExtractEmbedded => 1);
        $mainTool->Options(Duplicates => 1);
        next;
    }
    if ($a eq 'execute') {
        if (@nextPass) {
            unshift @ARGV, @nextPass, '-execute';
            undef @nextPass;
            ++$pass;
            next;
        }
        $helped = 1;
        last if $doneCommonArgs or not @commonArgs;
        # execute common arguments for each command
        unshift @ARGV, @commonArgs, '-execute';
        $doneCommonArgs = 1;
        next;
    }
    if (/^-?ext(ension)?$/i) {
        my $ext = shift;
        defined $ext or Die "Expecting extension for -ext option\n";
        $ext =~ s/^\.//;    # remove leading '.' if it exists
        my $flag = /^-/ ? 0 : 1;
        $filterFlag |= (0x01 << $flag);
        $filterExt{uc($ext)} = $flag;
        next;
    }
    if (/^f$/ or $a eq 'forceprint') {
        $forcePrint = 1;
        $mainTool->Options(MissingTagValue => '-');
        next;
    }
    if (/^F([-+]?\d*)$/ or /^fixbase([-+]?\d*)$/i) {
        $mainTool->Options(FixBase => $1);
        next;
    }
    if (/^fast(\d*)$/i) {
        $mainTool->Options(FastScan => (length $1 ? $1 : 1));
        next;
    }
    if ($a eq 'fileorder') {
        push @fileOrder, shift if @ARGV;
        next;
    }
    if (/^(g)(roupHeadings|roupNames)?([\d:]*)$/i) {
        $showGroup = $3 || 0;
        $allGroup = ($2 ? lc($2) eq 'roupnames' : $1 eq 'G');
        next;
    }
    if ($a eq 'geotag') {
        my $trkfile = shift or Die "Expecting file name for -geotag option\n";
        # allow wildcards in filename
        if ($trkfile =~ /[*?]/) {
            my @trks = $doGlob ? File::Glob::bsd_glob($trkfile) : glob($trkfile);
            @trks or Die "No matching file found for -geotag option\n";
            push @newValues, 'geotag='.shift(@trks) while @trks > 1;
            $trkfile = pop(@trks);
        }
        $_ = "geotag=$trkfile";
        # (fall through!)
    }
    if (/^h$/ or $a eq 'htmlformat') {
        require Image::ExifTool::HTML;
        $html = $escapeHTML = 1;
        $json = $xml = 0;
        next;
    }
    (/^H$/ or $a eq 'hex') and $showTagID = 'H', next;
    if (/^htmldump([-+]?\d+)?$/i) {
        $verbose = ($verbose || 0) + 1;
        $html = 2;
        $mainTool->Options(HtmlDumpBase => $1) if defined $1;
        next;
    }
    /^i(gnore)?$/i and push(@ignore,shift || Die "Expecting directory name for -i option\n"), next;
    if ($a eq 'if') {
        my $cond = shift;
        defined $cond or Die("Expecting expression for -if option\n");
        $useMWG = 1 if $cond =~ /\$\{?mwg:/i;
        if (defined $condition) {
            $condition .= " and $cond";
        } else {
            $condition = $cond;
        }
        next;
    }
    /^j(son)?$/i and $json = 1, $html = $xml = 0, $mainTool->Options(Duplicates => 1), next;
    /^(k|pause)$/i and $pause = 1, next;
    (/^l$/ or $a eq 'long') and --$outFormat, next;
    (/^L$/ or $a eq 'latin') and $utf8 = 0, $mainTool->Options(Charset => 'Latin'), next;
    if ($a eq 'lang') {
        my $lang = (@ARGV and $ARGV[0] !~ /^-/) ? shift : undef;
        if ($lang) {
            # make lower case and use underline as a separator (ie. 'en_ca')
            $lang =~ tr/-A-Z/_a-z/;
            $mainTool->Options(Lang => $lang);
            next if $lang eq $mainTool->Options('Lang');
        } else {
            $pass or push(@nextPass, '-lang'), next;
        }
        my $langs = "Available languages:\n";
        $langs .= "  $_ - $Image::ExifTool::langName{$_}\n" foreach @Image::ExifTool::langs;
        $langs = $mainTool->Decode($langs, 'UTF8');
        $langs = Image::ExifTool::HTML::EscapeHTML($langs) if $escapeHTML;
        Die "Invalid or unsupported language '$lang'.\n$langs" if $lang;
        print $langs;
        $helped = 1;
        next;
    }
    /^(m|ignoreminorerrors)$/i and $mainTool->Options(IgnoreMinorErrors => 1), next;
    /^(n|-printconv)$/i and $mainTool->Options(PrintConv => 0), next;
    /^(-n|printconv)$/i and $mainTool->Options(PrintConv => 1), next;
    if (/^o(ut)?$/i) {
        $outOpt = shift || Die("Expected output file or directory name for -o option\n");
        CleanFilename($outOpt);
        next;
    }
    /^overwrite_original$/i and $overwriteOrig = 1, next;
    /^overwrite_original_in_place$/i and $overwriteOrig = 2, next;
    (/^p$/ or $a eq 'printformat') and LoadPrintFormat(shift), next;
    (/^P$/ or $a eq 'preserve') and $preserveTime = 1, next;
    /^q(uiet)?$/i and ++$quiet, next;
    /^r(ecurse)?$/i and $recurse = 1, next;
    (/^s$/ or $a eq 'short') and ++$outFormat, next;
    (/^S$/ or $a eq 'veryshort') and $outFormat+=2, next;
    /^scanforxmp$/i and $mainTool->Options(ScanForXMP => 1), next;
    if (/^sep(arator)?$/i) {
        $listSep = shift;
        defined $listSep or Die("Expecting list item separator for -sep option\n");
        $mainTool->Options(ListSep => $listSep);
        $joinLists = 1;
        # also split when writing values
        my $listSplit = quotemeta $listSep;
        # a space in the string matches zero or more whitespace characters
        $listSplit =~ s/(\\ )+/\\s\*/g;
        # but a single space alone matches one or more whitespace characters
        $listSplit = '\\s+' if $listSplit eq '\\s*';
        $mainTool->Options(ListSplit => $listSplit);
        next;
    }
    /^srcfile$/i and $srcFmt = shift || Die("Expecting FMT for -srcfile option\n"), next;
    /^struct$/i and $structOpt = 1, next;
    /^t(ab)?$/  and $tabFormat = 1, next;
    if (/^T$/ or $a eq 'table') {
        $tabFormat = 1; $outFormat+=2; ++$quiet; $forcePrint = 1;
        $mainTool->Options(MissingTagValue => '-');
        next;
    }
    if (/^(u)(nknown(2)?)?$/i) {
        my $inc = ($3 or (not $2 and $1 eq 'U')) ? 2 : 1;
        $mainTool->Options(Unknown => $mainTool->Options('Unknown') + $inc);
        next;
    }
    if ($a eq 'use') {
        my $module = shift || Die("Expecting module name for -use option\n");
        lc $module eq 'mwg' and $useMWG = 1, next;
        local $SIG{'__WARN__'} = sub { $evalWarning = $_[0] };
        unless (eval "require Image::ExifTool::$module" or
                eval "require $module" or
                eval "require '$module'")
        {
            delete $SIG{'__WARN__'};
            Die("Error using module $module\n");
        }
        next;
    }
    if (/^v(erbose)?(\d*)$/i) {
        $verbose = ($2 eq '') ? ($verbose || 0) + 1 : $2;
        next;
    }
    /^(w|textout)$/i and $outputExt = shift || Die("Expecting output extension for -w option\n"), next;
    if (/^x$/ or $a eq 'exclude') {
        my $tag = shift;
        defined $tag or Die "Expecting tag name for -x option\n";
        $tag =~ s/\ball\b/\*/ig;    # replace 'all' with '*' in tag names
        if ($setTagsFile) {
            push @{$setTags{$setTagsFile}}, "-$tag";
        } else {
            push @exclude, $tag;
        }
        next;
    }
    (/^X$/ or $a eq 'xmlformat') and $xml = 1, $html = $json = 0, $mainTool->Options(Duplicates => 1), next;
    /^z(ip)?$/i and $doUnzip = 1, $mainTool->Options(Compress => 1), next;
    $_ eq '' and push(@files, '-'), next;   # read STDIN
    length $_ eq 1 and Die "Unknown option -$_\n";
    if (/^[^<]+(<?)=(.*)/s) {
        my $val = $2;
        push @newValues, $_;
        if (/^mwg:/i) {
            $useMWG = 1;
        } elsif (/^([-\w]+:)*(filename|directory)\b/i) {
            $doSetFileName = 1;
        } elsif (/^([-\w]+:)*(geotag|geotime)\b/i) {
            if (lc $2 eq 'geotag') {
                if (not defined $addGeotime or $addGeotime) {
                    $addGeotime = ($1 || '') . 'Geotime';
                    $addGeotime .= length $val ? '<DateTimeOriginal' : '=';
                }
            } else {
                $addGeotime = '';
            }
        }
    } else {
        if (not $setTagsFile and /(<|>)/) {
            # assume '-tagsFromFile @' if tags are being redirected
            # and -tagsFromFile hasn't already been specified
            $setTagsFile = '@';
            push(@newValues, "TagsFromFile=@");
            $setTags{$setTagsFile} or $setTags{$setTagsFile} = [];
        }
        if ($setTagsFile) {
            push @{$setTags{$setTagsFile}}, $_;
            if (/>/) {
                $useMWG = 1 if /^(.*>\s*)?mwg:/si;
                if (/\b(filename|directory)#?$/i) {
                    $doSetFileName = 1;
                } elsif (/\bgeotime#?$/i) {
                    $addGeotime = '';
                }
            } else {
                $useMWG = 1 if /^([^<]+<\s*(.*\$\{?)?)?mwg:/si;
                if (/^([-\w]+:)*(filename|directory)\b/i) {
                    $doSetFileName = 1;
                } elsif (/^([-\w]+:)*geotime\b/i) {
                    $addGeotime = '';
                }
            }
        } elsif (/^-(.*)/) {
            push @exclude, $1;
        } else {
            push @tags, $_;
        }
    }
  } elsif ($doGlob and /[*?]/) {
    # glob each filespec if necessary - MK/20061010
    push @files, File::Glob::bsd_glob($_);
    $doGlob = 2;
  } else {
    push @files, $_;
  }
}

# print help
unless ((@tags and not $outOpt) or @files or @newValues) {
    if ($doGlob and $doGlob == 2) {
        Warn "No matching files\n";
        $rtnVal = 1;
        next;
    }
    if ($outOpt) {
        Warn "Nothing to write\n";
        $rtnVal = 1;
        next;
    }
    unless ($helped) {
        # catch warnings if we have problems running perldoc
        local $SIG{'__WARN__'} = sub { $evalWarning = $_[0] };
        my $dummy = \*SAVEERR;  # avoid "used only once" warning
        open SAVEERR, ">&STDERR";
        open STDERR, '>/dev/null';
        if (system('perldoc',$0)) {
            print "Syntax:  exiftool [OPTIONS] FILE\n\n";
            print "Consult the exiftool documentation for a full list of options.\n";
        }
        close STDERR;
        open STDERR, '>&SAVEERR';
    }
    next;
}

if ($overwriteOrig > 1 and $outOpt) {
    Warn "Can't overwrite in place when -o option is used\n";
    $rtnVal = 1;
    next;
}

if ($escapeHTML or $json) {
    # must be UTF8 for HTML conversion and JSON output
    $mainTool->Options(Charset => 'UTF8');
    # use Escape option to do our HTML escaping unless XML output
    $mainTool->Options(Escape => 'HTML') if $escapeHTML and not $xml;
} elsif ($escapeXML and not $xml) {
    $mainTool->Options(Escape => 'XML');
}

# set up for RDF/XML and JSON output formats
if ($xml) {
    require Image::ExifTool::XMP;   # for EscapeXML()
    my $charset = $mainTool->Options('Charset');
    # standard XML encoding names for supported Charset settings
    # (ref http://www.iana.org/assignments/character-set)
    my %encoding = (
        UTF8     => 'UTF-8',
        Latin    => 'windows-1252',
        Latin2   => 'windows-1250',
        Cyrillic => 'windows-1251',
        Greek    => 'windows-1253',
        Turkish  => 'windows-1254',
        Hebrew   => 'windows-1255',
        Arabic   => 'windows-1256',
        Baltic   => 'windows-1257',
        Vietnam  => 'windows-1258',
        MacRoman => 'macintosh',
    );
    # switch to UTF-8 if we don't have a standard encoding name
    unless ($encoding{$charset}) {
        $charset = 'UTF8';
        $mainTool->Options(Charset => $charset);
    }
    # set file header/trailer for XML output
    $fileHeader = "<?xml version='1.0' encoding='$encoding{$charset}'?>\n" .
                  "<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>\n";
    $fileTrailer = "</rdf:RDF>\n";
    # extract as a list unless short output format
    $joinLists = 1 if $outFormat > 0;
    $mainTool->Options(List => 1) unless $joinLists;
    $mainTool->Options(Struct => 1) if $structOpt and $outFormat <= 0;
    $showGroup = $allGroup = 1;         # always show group 1
    # set binaryOutput flag to 0 or undef (0 = output encoded binary in XML)
    $binaryOutput = ($outFormat > 0 ? undef : 0) if $binaryOutput;
    $showTagID = 'D' if $tabFormat and not $showTagID;
} elsif ($json) {
    $fileHeader = "[";
    $fileTrailer = "]\n";
    $mainTool->Options(List => 1) unless $joinLists;
    $mainTool->Options(Duplicates => 0) unless defined $showGroup;
    $mainTool->Options(Struct => 1) if $structOpt;
    undef $binaryOutput; # can't currently use -b with -json
} else {
    $joinLists = 1; # join lists for all other output formats
}

# change to forward slashes if necessary in all filenames (like CleanFilename)
if ($hasBackslash{$^O}) {
    tr/\\/\// foreach @files;
}

# can't do anything if no file specified
unless (@files) {
    unless ($outOpt) {
        Warn "No file specified\n";
        $rtnVal = 1;
        next;
    }
    push @files, '';    # create file from nothing
}

# set Verbose and HtmlDump options
if ($verbose) {
    $disableOutput = 1 unless @tags or @exclude;
    undef $binaryOutput;    # disable conflicting option
    if ($html) {
        $html = 2;    # flag for html dump
        $mainTool->Options(HtmlDump => $verbose);
    } else {
        $mainTool->Options(Verbose => $verbose);
    }
} elsif (defined $verbose) {
    # auto-flush output when -v0 is used
    require FileHandle;
    STDOUT->autoflush(1);
    STDERR->autoflush(1);
}

# validate all tags we're writing
if (@newValues) {
    # assume -geotime value if -geotag specified without -geotime
    if ($addGeotime) {
        if ($addGeotime =~ /=$/) {
            push @newValues, $addGeotime;   # deleting
        } else {
            unless ($setTagsFile and $setTagsFile eq '@') {
                $setTagsFile = '@';
                push(@newValues, "TagsFromFile=@");
                $setTags{$setTagsFile} or $setTags{$setTagsFile} = [];
            }
            push @{$setTags{$setTagsFile}}, $addGeotime;
        }
        $verbose and print qq{Argument "-$addGeotime" is assumed\n};
    }
    my %addDelOpt = ( '+' => 'AddValue', '-' => 'DelValue' );   # add/delete option lookup
    foreach (@newValues) {
        /(.*?)=(.*)/s or next;
        my ($tag, $newVal) = ($1, $2);
        $tag =~ s/\ball\b/\*/ig;    # replace 'all' with '*' in tag names
        $newVal eq '' and undef $newVal;    # undefined to delete tag
        if ($tag =~ /^(All)?TagsFromFile$/i) {
            Die "Need file name for -tagsFromFile\n" unless defined $newVal;
            ++$isWriting;
            if ($newVal eq '@' or not defined FilenameSPrintf($newVal)) {
                push @dynamicFiles, $newVal unless grep /^$newVal$/, @dynamicFiles;
                next;   # set tags from dynamic file later
            }
            unless (-e $newVal) {
                Warn "File '$newVal' does not exist for -tagsFromFile option\n";
                $rtnVal = 1;
                next Command;
            }
            # set specified tags from this file
            $verbose and print("Setting new values from $newVal\n");
            my $info = $mainTool->SetNewValuesFromFile($newVal, @{$setTags{$newVal}});
            if ($info->{Error}) {
                my $err = $info->{Error};
                delete $info->{Error};
                delete $info->{Warning};
                if (%$info) {
                    $info->{Warning} = $err;    # downgrade to a warning
                } else {
                    # no tags set so error must have been fatal
                    Warn "Error: $err - $newVal\n";
                    $rtnVal = 1;
                    next Command;
                }
            }
            if ($info->{Warning}) {
                Warn "Warning: $info->{Warning} - $newVal\n";
                delete $info->{Warning};
            }
            %$info or Warn "No writable tags found - $newVal\n";
            next;
        } elsif ($tag =~ /^PreviewImage$/i) {
            # can't delete preview image, so we can set it to ''
            $newVal = '' unless defined $newVal;
        }
        my %opts = (
            Protected => 1, # allow writing of 'unsafe' tags
            Shift => 0,     # shift values if possible instead of adding/deleting
        );
        if ($tag =~ s/<// and defined $newVal) {
            if (defined FilenameSPrintf($newVal)) {
                SlurpFile($newVal, \$newVal) or next;
            } else {
                $tag =~ s/([-+])$// and $opts{$addDelOpt{$1}} = 1;
                # verify that this tag can be written
                my $result = Image::ExifTool::IsWritable($tag);
                if ($result) {
                    # add to list of dynamic tag values
                    push @dynamicValues, [ $tag, $newVal, \%opts ];
                    ++$isWriting;
                } elsif (defined $result) {
                    Warn "Tag '$tag' is not writable\n";
                } else {
                    Warn "Tag '$tag' does not exist\n";
                }
                next;
            }
        }
        if ($tag =~ s/([-+])$//) {
            $opts{$addDelOpt{$1}} = 1;  # set AddValue or DelValue option
            # set $newVal to '' if deleting nothing
            $newVal = '' if $1 eq '-' and not defined $newVal;
        }
        my ($rtn, $wrn) = $mainTool->SetNewValue($tag, $newVal, %opts);
        ++$isWriting if $rtn;
        $wrn and Warn "Warning: $wrn\n";
    }
    # exclude specified tags
    foreach (@exclude) {
        $mainTool->SetNewValue($_, undef, Replace => 2);
    }
    unless ($isWriting or $outOpt or @tags) {
        Warn "Nothing to do.\n";
        $rtnVal = 1;
        next;
    }
} elsif (grep /^(\*:)?\*$/, @exclude) {
    Warn "All tags excluded -- nothing to do.\n";
    $rtnVal = 1;
    next;
}
if ($isWriting and @tags and not $outOpt) {
    my ($tg, $s) = @tags > 1 ? ("$tags[0] ...", 's') : ($tags[0], '');
    Warn "Ignored superfluous tag name$s or invalid option$s: -$tg\n";
}
# save current state of new values if setting values from target file
# or if we may be translating to a different format
$mainTool->SaveNewValues() if $outOpt or @dynamicFiles or @dynamicValues;

$multiFile = 1 if @files > 1;
@exclude and $mainTool->Options(Exclude => \@exclude);

if ($binaryOutput) {
    $outFormat = 99;    # shortest possible output format
    $mainTool->Options(PrintConv => 0);
    binmode(STDOUT);
    $binaryStdout = 1;
    # disable conflicting options
    undef $showGroup;
    $html = 0;
}

# sort by groups to look nicer depending on options
if (defined $showGroup and not (@tags and $allGroup)) {
    $mainTool->Options(Sort => "Group$showGroup"),
}

if (defined $outputExt) {
    CleanFilename($outputExt);  # make all forward slashes
    # add '.' before output extension if necessary
    $outputExt = ".$outputExt" unless $outputExt =~ /[.%]/;
}

# determine if we should scan for only writable files
if ($outOpt) {
    my $type = GetFileType($outOpt);
    if ($type) {
        unless (CanWrite($type)) {
            Warn "Can't write $type files\n";
            $rtnVal = 1;
            next;
        }
        $scanWritable = $type unless CanCreate($type);
    } else {
        $scanWritable = 1;
    }
    $isWriting = 1;     # set writing flag
} elsif ($isWriting) {
    $scanWritable = 1;
}

# set flag to fix description lengths if necessary
$fixLen = ($utf8 and $mainTool->Options('Lang') ne 'en' and eval 'require Encode');

# sort input files if specified
if (@fileOrder) {
    my @allFiles;
    ProcessFiles(undef, \@allFiles);
    my $sortTool = new Image::ExifTool;
    $sortTool->Options(PrintConv => $mainTool->Options('PrintConv'));
    $sortTool->Options(Duplicates => 0);
    my (%sortBy, %isFloat, @rev, $file);
    # save reverse sort flags
    push @rev, (s/^-// ? 1 : 0) foreach @fileOrder;
    foreach $file (@allFiles) {
        my @tags;
        my $info = $sortTool->ImageInfo($file, @fileOrder, \@tags);
        # get values of all tags (or '~' to sort last if not defined)
        foreach (@tags) {
            $_ = $$info{$_};
            defined $_ or $_ = '~', next;
            $isFloat{$_} = 1 if /^[+-]?(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/;
        }
        $sortBy{$file} = \@tags;    # save tag values for each file
    }
    # sort in specified order
    @files = sort {
        my ($i, $cmp);
        for ($i=0; $i<@rev; ++$i) {
            my $u = $sortBy{$a}[$i];
            my $v = $sortBy{$b}[$i];
            if (not $isFloat{$u} and not $isFloat{$v}) {
                $cmp = $u cmp $v;               # alphabetically
            } elsif ($isFloat{$u} and $isFloat{$v}) {
                $cmp = $u <=> $v;               # numerically
            } else {
                $cmp = $isFloat{$u} ? -1 : 1;   # numbers first
            }
            return $rev[$i] ? -$cmp : $cmp if $cmp;
        }
        return $a cmp $b;   # default to sort by name
    } @allFiles;
}

# process all specified files
ProcessFiles($mainTool);

if ($filtered and not $validFile) {
    Warn "No file with specified extension\n";
    $rtnVal = 1;
}

# print file trailer if necessary
print $fileTrailer if $fileTrailer and not $outputExt and not $fileHeader;

# print summary and exit
my $tot = $count + $countBad;
my $totWr = $countGoodWr + $countBadWr + $countSameWr + $countCopyWr +
            $countGoodCr + $countBadCr;
if (($countDir or $totWr or $countFailed or $tot > 1 or $outputExt) and
    not ($binaryStdout or $quiet))
{
    my $o = (($html or $json or $xml or %printFmt) and not $outputExt) ? \*STDERR : \*STDOUT;
    printf($o "%5d directories scanned\n", $countDir) if $countDir;
    printf($o "%5d directories created\n", $countNewDir) if $countNewDir;
    printf($o "%5d files failed condition\n", $countFailed) if $countFailed;
    printf($o "%5d image files created\n", $countGoodCr) if $countGoodCr;
    printf($o "%5d image files updated\n", $countGoodWr) if $totWr - $countGoodCr - $countBadCr;
    printf($o "%5d image files unchanged\n", $countSameWr) if $countSameWr;
    printf($o "%5d image files copied\n", $countCopyWr) if $countCopyWr;
    printf($o "%5d files weren't updated due to errors\n", $countBadWr) if $countBadWr;
    printf($o "%5d files weren't created due to errors\n", $countBadCr) if $countBadCr;
    printf($o "%5d image files read\n", $count) if $tot>1 or ($countDir and not $totWr);
    printf($o "%5d files could not be read\n", $countBad) if $countBad;
    printf($o "%5d output files created\n", $countCreated) if $outputExt;
}

# set error status if we had any errors
$rtnVal = 1 if $countBadWr or $countBadCr or $countBad or ($countFailed and not $count);

} # end "Command" loop

Exit $rtnVal;   # all done


#------------------------------------------------------------------------------
# Get image information from EXIF data in file
# Inputs: 0) ExifTool object reference, 1) file name
sub GetImageInfo($$)
{
    my ($exifTool, $orig) = @_;
    my (@foundTags, $info, $writeOnly);
    my $file = SourceFile($orig);
    my $pipe = $file;
    my $ind;

    if ($doUnzip) {
        # pipe through gzip or bzip2 if necessary
        if ($file =~ /\.gz$/i) {
            $pipe = qq{gzip -dc "$file" |};
        } elsif ($file =~ /\.bz2$/i) {
            $pipe = qq{bzip2 -dc "$file" |};
        }
    }
    # evaluate -if expression for conditional processing
    if (defined $condition) {
        # catch run time errors as well as compile errors
        undef $evalWarning;
        local $SIG{'__WARN__'} = sub { $evalWarning = $_[0] };

        my %info;
        # extract information and build expression for evaluation
        my $opts = { Duplicates => 1, Verbose => 0, HtmlDump => 0 };
        # return all tags but explicitly mention tags on command line so
        # requested images will generate the appropriate warnings
        @foundTags = ('*', @tags) if @tags;
        $info = $exifTool->ImageInfo($pipe, \@foundTags, $opts);
        my $cond = $exifTool->InsertTagValues(\@foundTags, $condition, \%info);

        #### eval "-if" condition (%info)
        my $result = eval $cond;

        $@ and $evalWarning = $@;
        if ($evalWarning) {
            # fail condition if warning is issued
            undef $result;
            if ($verbose) {
                chomp $evalWarning;
                $evalWarning =~ s/ at \(eval .*//s;
                delete $SIG{'__WARN__'};
                Warn "Condition: $evalWarning - $file\n";
            }
        }
        unless ($result) {
            $verbose and print "-------- $file (failed condition)\n";
            ++$countFailed;
            return;
        }
        # can't make use of $info if verbose because we must reprocess
        # the file anyway to generate the verbose output
        undef $info if $verbose;
    }
    my $lineCount = 0;
    my ($fp, $outfile);
    if ($outputExt and $verbose) {
        ($fp, $outfile) = OpenOutputFile($orig);
        $fp or ++$countBad, return;
        $tmpText = $outfile;    # deletes file if we exit prematurely
        $exifTool->Options(TextOut => $fp);
    }

    if ($isWriting) {
        print "======== $file\n" if defined $verbose;
        my $success = SetImageInfo($exifTool, $orig);
        $info = $exifTool->GetInfo('Warning', 'Error');
        PrintErrors($exifTool, $info, $file);
        # close output text file if necessary
        if ($outfile) {
            undef $tmpText;
            close($fp);
            $exifTool->Options(TextOut => \*STDOUT);
            if ($info->{Error}) {
                unlink $outfile;    # erase bad file
            } else {
                ++$countCreated;
            }
        }
        return;
    } else {
        my $tag;
        # extract EXIF information from this file
        unless ($file eq '-' or -e $file) {
            Warn "File not found: $file\n";
            $outfile and close($fp), undef($tmpText), unlink($outfile);
            ++$countBad;
            return;
        }
        unless ($binaryOutput or $outputExt or %printFmt or $html > 1) {
            if ($html) {
                require Image::ExifTool::HTML;
                my $f = Image::ExifTool::HTML::EscapeHTML($file);
                print "<!-- $f -->\n";
            } elsif (not ($json or $xml)) {
                print "======== $file\n" if $multiFile and not $quiet;
            }
        }
        if ($info) {
            # get the information we wanted
            if (@tags and not %printFmt) {
                @foundTags = @tags;
                $info = $exifTool->GetInfo(\@foundTags);
            }
        } else {
            # request specified tags unless using print format option
            my $oldDups = $exifTool->Options('Duplicates');
            if (%printFmt) {
                $exifTool->Options(Duplicates => 1);
            } else {
                @foundTags = @tags;
            }
            # extract the information
            $info = $exifTool->ImageInfo($pipe, \@foundTags);
            $exifTool->Options(Duplicates => $oldDups);
        }
        # all done now if we already wrote output text file (ie. verbose option)
        if ($fp) {
            if ($outfile) {
                $exifTool->Options(TextOut => \*STDOUT);
                undef $tmpText;
                if ($info->{Error}) {
                    close($fp);
                    unlink $outfile;    # erase bad file
                } else {
                    ++$lineCount;       # output text file (likely) is not empty
                }
            }
            if ($info->{Error}) {
                Warn "Error: $info->{Error} - $file\n";
                ++$countBad;
                return;
            }
        }
    }
    # print warnings to stderr if using binary output
    # (because we are likely ignoring them and piping stdout to file)
    # or if there is none of the requested information available
    if ($binaryOutput or not %$info) {
        my $errs = $exifTool->GetInfo('Warning', 'Error');
        PrintErrors($exifTool, $errs, $file);
    }

    # open output file (or stdout if no output file) if not done already
    unless ($fp) {
        ($fp, $outfile) = OpenOutputFile($orig);
        $fp or ++$countBad, return;
    }

    # print the results for this file
    if (%printFmt) {
        # output using print format file (-p) option
        my ($type, $doc, $grp);
        undef $fileTrailer;
        # repeat for each embedded document if necessary
        my $lastDoc = $exifTool->Options('ExtractEmbedded') ? $exifTool->{DOC_COUNT} : 0;
        foreach $type ('HEAD', 'BODY', 'TAIL') {
            my $prf = $printFmt{$type} or next;
            for ($doc=0; $doc<=$lastDoc; ++$doc) {
                if ($lastDoc) {
                    if ($doc) {
                        last unless $type eq 'BODY'; # only repeat BODY lines
                        $grp = "Doc$doc:";
                    } else {
                        $grp = 'Main:';
                    }
                    # change tag groups to print next document by adding "Main:" or "Doc#:"
                    # to all tags which don't already start with a family 3 group name
                    $prf = [ @{$printFmt{$type}} ];
                    s/((^|[^\$])(\$\$)*\$\{?)((?!(Main|Doc\d+):)[\w])/$1$grp$4/ig foreach @$prf;
                }
                my @lines;
                foreach (@$prf) {
                    my $line = $exifTool->InsertTagValues(\@foundTags, $_, 'Warn');
                    push @lines, $line if defined $line;
                }
                $lineCount += scalar @lines;
                if ($type eq 'TAIL') {
                    $fileTrailer = '' unless defined $fileTrailer;
                    $fileTrailer .= join '', @lines;
                } elsif (@lines) {
                    print $fp @lines;
                }
            }
        }
        delete $printFmt{HEAD} unless $outfile; # print header only once per output file
        my $errs = $exifTool->GetInfo('Warning', 'Error');
        PrintErrors($exifTool, $errs, $file);
    } elsif (not $disableOutput) {
        # print file header (only once)
        if ($fileHeader) {
            print $fp $fileHeader;
            undef $fileHeader unless $outputExt;
        }
        my ($tag, $line, %noDups);
        if ($html) {
            print $fp "<table>\n";
        } elsif ($xml) {
            my $f = $file;
            CleanXML(\$f);
            print $fp "\n<rdf:Description rdf:about='$f'";
            print $fp "\n  xmlns:et='http://ns.exiftool.ca/1.0/'";
            print $fp " et:toolkit='Image::ExifTool $Image::ExifTool::VERSION'";
            # define namespaces for all tag groups
            my %groups;
            foreach $tag (@foundTags) {
                my ($grp, $grp1) = $exifTool->GetGroup($tag);
                unless ($grp1) {
                    next unless $forcePrint;
                    $grp = $grp1 = 'Unknown';
                }
                next if $groups{$grp1};
                $groups{$grp1} = 1;
                # include family 0 and 1 groups in URI except for internal tags
                # (this will put internal tags in the "XML" group on readback)
                $grp .= "/$grp1" unless $grp eq $grp1 and
                                        $grp =~ /^(ExifTool|File|Composite|Unknown)$/;
                print $fp "\n  xmlns:$grp1='http://ns.exiftool.ca/$grp/1.0/'";
            }
            print $fp '>' if $outFormat < 1; # finish rdf:Description token unless short format
            $ind = $outFormat >= 0 ? ' ' : '   ';
        } elsif ($json) {
            print $fp ",\n" if $comma;
            print $fp qq({\n  "SourceFile": ), EscapeJSON($file, 1);
            $comma = 1;
            $ind = (defined $showGroup and not $allGroup) ? '    ' : '  ';
        }
        # suppress duplicates manually in JSON and short XML output
        my $noDups = ($json or ($xml and $outFormat > 0));
        my $printConv = $mainTool->Options('PrintConv');
        my $lastGroup = '';
        foreach $tag (@foundTags) {
            my $tagName = GetTagName($tag);
            my $group;
            # make sure this tag has a value
            my $val = $info->{$tag};
            if (not defined $val) {
                # ignore tags that weren't found unless necessary
                next if $binaryOutput;
                next unless $forcePrint;
                $val = '-';     # forced to print all tag values
            }
            if (defined $showGroup) {
                $group = $exifTool->GetGroup($tag, $showGroup);
                # look ahead to see if this tag may suppress a priority tag in
                # the same group, and if so suppress this tag instead
                next if $noDups and $tag =~ /(\S+) / and defined $$info{$1} and
                        $group eq $exifTool->GetGroup($1, $showGroup);
                $group = 'Unknown' if not $group and ($xml or $json);
                unless ($allGroup) {
                    if ($lastGroup ne $group) {
                        if ($html) {
                            my $cols = 1;
                            ++$cols if $outFormat==0 or $outFormat==1;
                            ++$cols if $showTagID;
                            print $fp "<tr><td colspan=$cols bgcolor='#dddddd'>$group</td></tr>\n";
                        } elsif ($json) {
                            print $fp "\n  }" if $lastGroup;
                            print $fp ',' if $lastGroup or $comma;
                            print $fp qq(\n  "$group": {);
                            undef $comma;
                            undef %noDups;  # allow duplicate names in different groups
                        } else {
                            print $fp "---- $group ----\n";
                        }
                        $lastGroup = $group;
                    }
                    undef $group;   # undefine so we don't print it below
                }
            }

            ++$lineCount;           # we are printing something meaningful

            if ($binaryOutput) {
                # translate scalar reference to actual binary data
                if (ref $val eq 'SCALAR') {
                    $val = $$val;
                } elsif (ref $val eq 'ARRAY') {
                    $val = join "\n", @$val;
                }
                print $fp $val;
                next;
            }
            if (ref $val eq 'SCALAR') {
                my $bOpt = $json ? '' : ', use -b option to extract';
                if ($$val =~ /^Binary data/) {
                    $val = "($$val$bOpt)";
                } elsif (defined $binaryOutput) { # this happens when -X is used with -b
                    # avoid writing Protected binary tags (ie. data blocks) [insider information]
                    next if $exifTool->{TAG_INFO}{$tag}{Protected};
                    $val = $$val;
                } else {
                    $val = '(Binary data ' . length($$val) . " bytes$bOpt)";
                }
            } elsif (ref $val eq 'ARRAY' and $joinLists and not ref $$val[0]) {
                # join arrays of simple values
                $val = join($listSep, @$val) if ref $val eq 'ARRAY';
            }

            # get description if we need it (use tag name if $outFormat > 0)
            my $desc = $outFormat > 0 ? $tagName : $exifTool->GetDescription($tag);

            if ($xml) {
                # RDF/XML output format
                my $tok = "$group:$tagName";
                if ($outFormat > 0) {
                    if ($escapeHTML) {
                        $val =~ tr/\0-\x08\x0b\x0c\x0e-\x1f/./;
                        Image::ExifTool::XMP::FixUTF8(\$val) if $utf8;
                        $val = Image::ExifTool::HTML::EscapeHTML($val);
                    } else {
                        CleanXML(\$val);
                    }
                    unless ($noDups{$tok}) {
                        print $fp "\n $tok='$val'";
                        # XML does not allow duplicate attributes
                        $noDups{$tok} = 1;
                    }
                    next;
                }
                my ($xtra, $valNum, $descClose);
                if ($showTagID) {
                    my ($id, $lang) = $exifTool->GetTagID($tag);
                    if ($id =~ /^\d+$/) {
                        $id = sprintf("0x%.4x", $id) if $showTagID eq 'H';
                    } else {
                        $id = Image::ExifTool::XMP::FullEscapeXML($id);
                    }
                    $xtra = " et:id='$id'";
                    $xtra .= " xml:lang='$lang'" if $lang;
                } else {
                    $xtra = '';
                }
                if ($tabFormat) {
                    my $table = $exifTool->GetTableName($tag);
                    my $index = $exifTool->GetTagIndex($tag);
                    $xtra .= " et:table='$table'";
                    $xtra .= " et:index='$index'" if defined $index;
                }
                my $lastVal = $val;
                for ($valNum=0; $valNum<2; ++$valNum) {
                    $val = FormatXML($val, $ind, $group);
                    if ($outFormat >= 0) {
                        # normal output format (note: this will give
                        # non-standard RDF/XML if there are any attributes)
                        print $fp "\n <$tok$xtra$val</$tok>";
                        last;
                    } elsif ($valNum == 0) {
                        CleanXML(\$desc);
                        if ($xtra) {
                            print $fp "\n <$tok>";
                            print $fp "\n  <rdf:Description$xtra>";
                            $descClose = "\n  </rdf:Description>";
                        } else {
                            print $fp "\n <$tok rdf:parseType='Resource'>";
                            $descClose = '';
                        }
                        # print tag Description
                        print $fp "\n   <et:desc>$desc</et:desc>";
                        if ($printConv) {
                            # print PrintConv value
                            print $fp "\n   <et:prt$val</et:prt>";
                            $val = $exifTool->GetValue($tag, 'ValueConv');
                            # go back to print ValueConv value only if different
                            next if ref $val ne 'SCALAR' and $val ne $lastVal;
                            print $fp "$descClose\n </$tok>";
                            last;
                        }
                    }
                    # print ValueConv value
                    print $fp "\n   <et:val$val</et:val>";
                    print $fp "$descClose\n </$tok>";
                    last;
                }
                next;
            } elsif ($json) {
                # JSON output format
                my $tok = $allGroup ? "$group:$tagName" : $tagName;
                next if $noDups{$tok};
                $noDups{$tok} = 1;
                print $fp ',' if $comma;
                print $fp qq(\n$ind"$tok": );
                PrintJSON($fp, $val, $ind);
                $comma = 1;
                next;
            }
            my $id;
            if ($showTagID) {
                $id = $exifTool->GetTagID($tag);
                if ($id =~ /^(\d+)(\.\d+)?$/) { # only print numeric ID's
                    $id = sprintf("0x%.4x", $1) if $showTagID eq 'H';
                } else {
                    $id = '-';
                }
            }

            # translate unprintable chars in value and remove trailing spaces
            $val =~ tr/\x01-\x1f\x7f/./;
            $val =~ s/\x00//g;
            $val =~ s/\s+$//;

            if ($html) {
                print $fp "<tr>";
                print $fp "<td>$group</td>" if defined $group;
                print $fp "<td>$id</td>" if $showTagID;
                print $fp "<td>$desc</td>" if $outFormat <= 1;
                print $fp "<td>$val</td></tr>\n";
            } else {
                my $buff = '';
                if ($tabFormat) {
                    $buff = "$group\t" if defined $group;
                    $buff .= "$id\t" if $showTagID;
                    if ($outFormat <= 1) {
                        $buff .= "$desc\t$val\n";
                    } elsif (defined $line) {
                        $line .= "\t$val";
                    } else {
                        $line = $val;
                    }
                } elsif ($outFormat < 0) {    # long format
                    $buff = "[$group] " if defined $group;
                    $buff .= "$id " if $showTagID;
                    $buff .= "$desc\n      $val\n";
                } elsif ($outFormat == 0 or $outFormat == 1) {
                    my $wid;
                    my $len = 0;
                    if (defined $group) {
                        $buff = sprintf("%-15s ", "[$group]");
                        $len = 16;
                    }
                    if ($showTagID) {
                        $wid = ($showTagID eq 'D') ? 5 : 6;
                        $len += $wid + 1;
                        ($wid = $len - length($buff) - 1) < 1 and $wid = 1;
                        $buff .= sprintf "%${wid}s ", $id;
                    }
                    $wid = 32 - (length($buff) - $len);
                    # pad description to a constant length
                    # (get actual character length when using alternate languages
                    # because these descriptions may contain UTF8-encoded characters)
                    my $padLen = $wid - length($fixLen ? Encode::decode_utf8($desc) : $desc);
                    $padLen = 0 if $padLen < 0;
                    $buff .= $desc . (' ' x $padLen) . ": $val\n";
                } elsif ($outFormat == 2) {
                    $buff = "[$group] " if defined $group;
                    $buff .= "$id " if $showTagID;
                    $buff .= "$tagName: $val\n";
                } else {
                    $buff = "$group " if defined $group;
                    $buff .= "$id " if $showTagID;
                    $buff .= "$val\n";
                }
                print $fp $buff;
            }
        }
        if ($html) {
            print $fp "</table>\n";
        } elsif ($xml) {
            # close rdf:Description element
            print $fp $outFormat < 1 ? "\n</rdf:Description>\n" : "/>\n";
        } elsif ($json) {
            print $fp "\n  }" if $lastGroup;
            print $fp "\n}";
            $comma = 1;
        } elsif ($tabFormat and $outFormat > 1) {
            print $fp "$line\n" if defined $line;
        }
    }
    if ($outfile) {
        print $fp $fileTrailer if $fileTrailer; # write file trailer
        close($fp);
        if ($lineCount) {
            ++$countCreated;
        } else {
            unlink $outfile; # don't keep empty output files
        }
    }
    ++$count;
}

#------------------------------------------------------------------------------
# Set information in file
# Inputs: 0) ExifTool object reference
#         1) original source file name ('' to create from scratch)
# Returns: true on success
sub SetImageInfo($$)
{
    my ($exifTool, $orig) = @_;
    my ($outfile, $restored, $isTemporary, $isStdout);
    my $file = SourceFile($orig);
    my $infile = $file;    # save infile in case we change it again
    my $tagsFromSrc;

    undef $tmpFile; # make sure this isn't defined

    # clear any existing errors or warnings since we check these on return
    delete $exifTool->{VALUE}->{Error};
    delete $exifTool->{VALUE}->{Warning};

    # first, try to determine our output file name so we can return quickly
    # if it already exists (note: this test must be delayed until after we
    # set tags from dynamic files if writing FileName or Directory)
    if (defined $outOpt) {
        if ($outOpt eq '-') {
            $isStdout = 1;
        } else {
            $outfile = FilenameSPrintf($outOpt, $orig);
            if ($outfile eq '') {
                Warn "Can't create file with zero-length name from $orig\n";
                ++$countBadCr;
                return 0;
            }
            if (-d $outfile or $outfile =~ /\/$/) {
                $outfile .= '/' unless $outfile =~ /\/$/;
                my $name = $file;
                $name =~ s/.*\///;  # remove directory name
                $outfile .= $name;
            } else {
                my $srcType = GetFileType($file) || '';
                my $outType = GetFileType($outfile);
                if ($outType and ($srcType ne $outType or $outType eq 'ICC')) {
                    unless (CanCreate($outfile)) {
                        my $what = $srcType ? 'other types' : 'scratch';
                        WarnOnce "Error: Can't create $outType files from $what\n";
                        ++$countBadCr;
                        return 0;
                    }
                    if ($file ne '') {
                        # restore previous new values unless done already
                        $exifTool->RestoreNewValues();
                        $restored = 1;
                        # translate to this type by setting specified tags from file
                        my @setTags = @tags;
                        foreach (@exclude) {
                            push @setTags, "-$_";
                        }
                        # force some tags to be copied for certain file types
                        my %forceCopy = (
                            ICC => 'ICC_Profile',
                            VRD => 'CanonVRD',
                        );
                        push @setTags, $forceCopy{$outType} if $forceCopy{$outType};
                        # assume "-tagsFromFile @" unless -tagsFromFile already specified
                        # (%setTags won't be empty if -tagsFromFile used)
                        if (not %setTags or (@setTags and not $setTags{'@'})) {
                            return 0 unless DoSetFromFile($exifTool, $file, \@setTags);
                        } elsif (@setTags) {
                            # add orphaned tags to existing "-tagsFromFile @" for this file only
                            push @setTags, @{$setTags{'@'}};
                            $tagsFromSrc = \@setTags;
                        }
                        # all done with source file -- create from meta information alone
                        $file = '';
                    }
                }
            }
            $outfile = NextUnusedFilename($outfile);
            if (-e $outfile and not $doSetFileName) {
                Warn "Error: '$outfile' already exists - $infile\n";
                ++$countBadWr;
                return 0;
            }
        }
    } elsif ($file eq '-') {
        $isStdout = 1;
    }
    # set new values with dynamic file names
    if (@dynamicValues) {
        # restore previous values if necessary
        $exifTool->RestoreNewValues() unless $restored;
        $restored = 1;
        my ($dyVal, $buff);
        foreach $dyVal (@dynamicValues) {
            my $dyfile = FilenameSPrintf($$dyVal[1], $orig);
            my ($rtn, $wrn);
            if (defined $dyfile and SlurpFile($dyfile, \$buff)) {
                $verbose and print "Reading $$dyVal[0] from $dyfile\n";
                ($rtn, $wrn) = $mainTool->SetNewValue($$dyVal[0], $buff, %{$$dyVal[2]});
                $wrn and Warn "$wrn\n";
            }
            # remove this tag if we couldn't set it properly
            $rtn or $mainTool->SetNewValue($$dyVal[0], undef, Replace => 2);
        }
    }
    # set tags from destination file if required
    if (@dynamicFiles) {
        # restore previous values if necessary
        $exifTool->RestoreNewValues() unless $restored;
        my $dyFile;
        foreach $dyFile (@dynamicFiles) {
            my ($fromFile, $setTags);
            if ($dyFile eq '@') {
                $fromFile = $orig;
                $setTags = $tagsFromSrc || $setTags{$dyFile};
            } else {
                $fromFile = FilenameSPrintf($dyFile, $orig);
                ++$countBadWr, return 0 unless defined $fromFile;
                $setTags = $setTags{$dyFile};
            }
            # set new values values from file
            return 0 unless DoSetFromFile($exifTool, $fromFile, $setTags);
        }
    }
    if ($isStdout) {
        # write to STDOUT
        $outfile = \*STDOUT;
        binmode(STDOUT);
        $binaryStdout = 1;
    } else {
        # determine what our output file name should be
        my $newFileName = $exifTool->GetNewValues('FileName');
        my $newDir = $exifTool->GetNewValues('Directory');
        if ($newFileName or $newDir or ($doSetFileName and defined $outfile)) {
            if ($newFileName) {
                $newFileName = FilenameSPrintf($newFileName, $orig);
                if (defined $outfile) {
                    $outfile = Image::ExifTool::GetNewFileName($orig, $outfile) if $orig ne '';
                    $outfile = Image::ExifTool::GetNewFileName($outfile, $newFileName);
                } elsif ($orig ne '') {
                    $outfile = Image::ExifTool::GetNewFileName($orig, $newFileName);
                }
            }
            if ($newDir) {
                $newDir = FilenameSPrintf($newDir, $orig);
                $outfile = Image::ExifTool::GetNewFileName(defined $outfile ? $outfile : $orig, $newDir);
            }
            $outfile = NextUnusedFilename($outfile, $infile);
            if (-e $outfile) {
                if ($infile ne $outfile) {
                    Warn "Error: '$outfile' already exists - $infile\n";
                    ++$countBadWr;
                    return 0;
                }
                undef $outfile; # not changing the file name after all
            }
        }
        if (defined $outfile) {
            $verbose and print "'$infile' --> '$outfile'\n";
            # create output directory if necessary
            CreateDirectory($outfile);
            # set temporary file (automatically erased on abnormal exit)
            $tmpFile = $outfile if defined $outOpt;
        }
        unless (defined $tmpFile) {
            # count the number of tags and pseudo-tags we are writing
            my ($numSet, $numPseudo) = $exifTool->CountNewValues();
            if (-e $file) {
                unless ($numSet) {
                    # no need to write if no tags set
                    print "Nothing changed in $file\n" if defined $verbose;
                    ++$countSameWr;
                    return 1;
                }
            } elsif (CanCreate($file)) {
                if ($numSet == $numPseudo) {
                    # no need to write if no real tags
                    Warn("Error: Nothing to write - $file\n");
                    ++$countBadWr;
                    return 0;
                }
                unless (defined $outfile) {
                    # create file from scratch
                    $outfile = $file;
                    $file = '';
                }
            } else {
                # file doesn't exist, and we can't create it
                Warn("Error: File not found - $file\n");
                ++$countBadWr;
                return 0;
            }
            # quickly rename file and/or set file date if this is all we are doing
            if ($numSet == $numPseudo) {
                my $r1 = $exifTool->SetFileModifyDate($file);
                my $r2 = 0;
                $r2 = $exifTool->SetFileName($file, $outfile) if defined $outfile;
                if ($r1 > 0 or $r2 > 0) {
                    ++$countGoodWr;
                } elsif ($r1 < 0 or $r2 < 0) {
                    ++$countBadWr;
                    return 0;
                } else {
                    ++$countSameWr;
                }
                return 1;
            }
            unless (defined $outfile) {
                # write to a truly temporary file
                $outfile = "${file}_exiftool_tmp";
                if (-e $outfile) {
                    Warn("Error: Temporary file already exists: $outfile\n");
                    ++$countBadWr;
                    return 0;
                }
                $isTemporary = 1;
            }
            # new output file is temporary until we know it has been written properly
            $tmpFile = $outfile;
        }
    }
    # rewrite the file
    my $success = $exifTool->WriteInfo($file, $outfile);

    # get file time if preserving it
    my ($modTime, $accTime);
    if ($preserveTime and $success and -e $file) {
        $modTime = $^T - (-M $file) * (24 * 3600);
        $accTime = $^T - (-A $file) * (24 * 3600);
    }
    if ($success == 1) {
        # preserve the original file times
        if (defined $tmpFile) {
            if (-e $file) {
                if ($preserveTime and not utime($accTime, $modTime, $tmpFile)) {
                    Warn "Error setting file time - $file\n";
                }
                if ($isTemporary) {
                    # move original out of the way
                    my $original = "${file}_original";
                    if (not $overwriteOrig and not -e $original) {
                        # rename the file and check again to be sure the file doesn't exist
                        # (in case, say, the filesystem truncated the file extension)
                        if (not rename($file, $original) or -e $file) {
                            Die "Error renaming $file\n";
                        }
                    }
                    if ($overwriteOrig > 1) {
                        # copy temporary file over top of original to preserve attributes
                        my ($err, $buff);
                        my $newFile = $tmpFile;
                        open(NEW_FILE, "<$newFile") or Die "Error opening $newFile\n";
                        binmode(NEW_FILE);
                        # must not erase temporary file now if interrupted
                        undef $tmpFile;
                        if (open(ORIG_FILE, ">$file")) {
                            $tmpFile = $file; # original is now our temporary file
                            binmode(ORIG_FILE);
                            while (read(NEW_FILE, $buff, 65536)) {
                                print ORIG_FILE $buff or $err = 1;
                            }
                            close(NEW_FILE);
                            close(ORIG_FILE) or $err = 1;
                            if ($err) {
                                Warn "Couldn't overwrite in place - $file\n";
                                undef $tmpFile;
                                unless (rename($newFile, $file) or
                                    (unlink $file and rename($newFile, $file)))
                                {
                                    Die "Error renaming $newFile to $file\n";
                                }
                            } else {
                                undef $tmpFile;
                                unlink $newFile;
                                if ($preserveTime and not utime($accTime, $modTime, $file)) {
                                    Warn "Error setting file time - $file\n";
                                }
                            }
                            ++$countGoodWr;
                        } else {
                            close(NEW_FILE);
                            Warn "Error opening $file for writing\n";
                            unlink $newFile;
                            ++$countBadWr;
                        }
                    # simply rename temporary file to replace original
                    # (if we didn't already rename it to add "_original")
                    } elsif (rename($tmpFile, $file)) {
                        ++$countGoodWr;
                    } else {
                        my $newFile = $tmpFile;
                        undef $tmpFile; # (avoid deleting file if we get interrupted)
                        # unlink may fail if already renamed or no permission
                        if (not unlink($file)) {
                            Warn "Error renaming temporary file to $file\n";
                            unlink $newFile;
                            ++$countBadWr;
                        } elsif (not rename($newFile, $file)) {
                            Warn "Error renaming temporary file to $file\n";
                            # (don't delete tmp file now because it is all we have left)
                            ++$countBadWr;
                        } else {
                            ++$countGoodWr;
                        }
                    }
                } elsif ($overwriteOrig) {
                    # erase original file
                    unlink $file or Warn "Error erasing original $file\n";
                    ++$countGoodWr;
                } else {
                    ++$countGoodCr;
                }
            } else {
                # this file was created from scratch, not edited
                ++$countGoodCr;
            }
        } else {
            ++$countGoodWr;
        }
    } elsif ($success) {
        if ($isTemporary) {
            # just erase the temporary file since no changes were made
            unlink $tmpFile;
            ++$countSameWr;
        } else {
            if (defined $accTime and not utime($accTime, $modTime, $outfile)) {
                Warn "Error setting file time - $file\n";
            }
            if ($overwriteOrig) {
                unlink $file or Warn "Error erasing original $file\n";
            }
            ++$countCopyWr;
        }
        print "Nothing changed in $file\n" if defined $verbose;
    } else {
        unlink $tmpFile if defined $tmpFile;
        ++$countBadWr;
    }
    undef $tmpFile;
    return $success;
}

#------------------------------------------------------------------------------
# Clean string for XML (also removes invalid control chars and malformed UTF-8)
# Inputs: 0) string ref
# Returns: nothing, but input string is escaped
sub CleanXML($)
{
    my $strPt = shift;
    # translate control characters that are invalid in XML
    $$strPt =~ tr/\0-\x08\x0b\x0c\x0e-\x1f/./;
    # fix malformed UTF-8 characters
    Image::ExifTool::XMP::FixUTF8($strPt) if $utf8;
    # escape necessary characters for XML
    $$strPt = Image::ExifTool::XMP::EscapeXML($$strPt);
}

#------------------------------------------------------------------------------
# Encode string for XML
# Inputs: 0) string ref
# Returns: encoding used (and input string is translated)
sub EncodeXML($)
{
    my $strPt = shift;
    if ($$strPt =~ /[\0-\x08\x0b\x0c\x0e-\x1f]/ or
        ($utf8 and Image::ExifTool::XMP::IsUTF8($strPt) < 0))
    {
        # encode binary data and non-UTF8 with special characters as base64
        $$strPt = Image::ExifTool::XMP::EncodeBase64($$strPt);
        return 'http://www.w3.org/2001/XMLSchema#base64Binary'; #ATV
    } elsif ($escapeHTML) {
        $$strPt = Image::ExifTool::HTML::EscapeHTML($$strPt);
    } else {
        $$strPt = Image::ExifTool::XMP::EscapeXML($$strPt);
    }
    return '';  # not encoded
}

#------------------------------------------------------------------------------
# Format value for XML output
# Inputs: 0) value, 1) indentation, 2) group
# Returns: formatted value
sub FormatXML($$$)
{
    local $_;
    my ($val, $ind, $grp) = @_;
    my $gt = '>';
    if (ref $val eq 'ARRAY') {
        # convert ARRAY into an rdf:Bag
        my $val2 = "\n$ind <rdf:Bag>";
        foreach (@$val) {
            $val2 .= "\n$ind  <rdf:li" . FormatXML($_, "$ind  ", $grp) . "</rdf:li>";
        }
        $val = "$val2\n$ind </rdf:Bag>\n$ind";
    } elsif (ref $val eq 'HASH') {
        $gt = " rdf:parseType='Resource'>";
        my $val2 = '';
        foreach (sort keys %$val) {
            my $tok = $grp . ':' . $_;
            $val2 .= "\n$ind <$tok" . FormatXML($$val{$_}, "$ind ", $grp) . "</$tok>";
        }
        $val = "$val2\n$ind";
    } else {
        my $enc = EncodeXML(\$val);
        $gt = " rdf:datatype='$enc'>\n" if $enc; #ATV
    }
    return $gt . $val;
}

#------------------------------------------------------------------------------
# Escape string for JSON
# Inputs: 0) string, 1) flag to force numbers to be quoted too
# Returns: Escaped string (quoted if necessary)
sub EscapeJSON($;$)
{
    my ($str, $quote) = @_;
    unless ($quote) {
        # JSON boolean (true or false)
        return lc($str) if $str =~ /^(true|false)$/i;
        # JSON number (see json.org for numerical format)
        return $str if $str =~ /^-?(\d|[1-9]\d+)(\.\d+)?(e[-+]?\d+)?$/i;
    }
    # escape special characters
    $str =~ s/(["\t\n\r\\])/\\$jsonChar{$1}/sg;
    # escape other control characters with \u
    $str =~ s/([\0-\x1f])/sprintf("\\u%.4X",ord $1)/sge;
    return '"' . $str . '"';    # return the quoted string
}

#------------------------------------------------------------------------------
# Print JSON value
# Inputs: 0) file reference, 1) value, 2) indentation
sub PrintJSON($$$)
{
    local $_;
    my ($fp, $val, $ind) = @_;
    my $comma;
    if (not ref $val) {
        print $fp EscapeJSON($val);
    } elsif (ref $val eq 'ARRAY') {
        if ($joinLists and not ref $$val[0]) {
            print $fp EscapeJSON(join($listSep,@$val));
        } else {
            print $fp '[';
            foreach (@$val) {
                print $fp ',' if $comma;
                PrintJSON($fp, $_, $ind);
                $comma = 1,
            }
            print $fp ']',
        }
    } elsif (ref $val eq 'HASH') {
        print $fp '{';
        foreach (sort keys %$val) {
            print $fp ',' if $comma;
            print $fp qq(\n$ind  "$_": );
            PrintJSON($fp, $$val{$_}, "$ind  ");
            $comma = 1,
        }
        print $fp "\n$ind}",
    } elsif (ref $val eq 'SCALAR') {
        if ($binaryOutput) {
            print $fp EscapeJSON($val);
        } else {
            print $fp '(Binary data ' . length($$val) . ' bytes)';
        }
    } else {
        print $fp '<err>';
    }
}

#------------------------------------------------------------------------------
# Set new values from file
# Inputs: 0) exiftool ref, 1) filename, 2) reference to list of values to set
# Returns: 0 on error (and increments $countBadWr)
sub DoSetFromFile($$$)
{
    my ($exifTool, $file, $setTags) = @_;
    $verbose and print "Setting new values from $file\n";
    my $info = $exifTool->SetNewValuesFromFile($file, @$setTags);
    PrintErrors($exifTool, $info, $file);
    $info->{Error} and ++$countBadWr, return 0;
    return 1;
}

#------------------------------------------------------------------------------
# Translate backslashes to forward slashes in filename if necessary
# Inputs: 0) Filename
# Returns: nothing, but changes filename if necessary
sub CleanFilename($)
{
    $_[0] =~ tr/\\/\// if $hasBackslash{$^O};
}

#------------------------------------------------------------------------------
# process files in our @files list
# Inputs: 0) ExifTool ref, 1) list ref to just return full file names
# Notes: arg 0 is not used if arg 1 is defined
sub ProcessFiles($;$)
{
    my ($exifTool, $list) = @_;
    my $file;
    foreach $file (@files) {
        if (-d $file) {
            $multiFile = $validFile = 1;
            ScanDir($mainTool, $file, $list);
        } elsif ($filterFlag and not AcceptFile($file)) {
            if (-e $file) {
                $filtered = 1;
                $verbose and print "-------- $file (wrong extension)\n";
            } else {
                Warn "File not found: $file\n";
                $rtnVal = 1;
            }
        } else {
            $validFile = 1;
            $list and push(@$list, $file), next;
            GetImageInfo($exifTool, $file);
        }
    }
}

#------------------------------------------------------------------------------
# Scan directory for image files
# Inputs: 0) ExifTool ref, 1) directory name, 2) list ref to return file names
sub ScanDir($$;$)
{
    my ($exifTool, $dir, $list) = @_;
    opendir(DIR_HANDLE, $dir) or Warn("Error opening directory $dir\n"), return;
    my @fileList = readdir(DIR_HANDLE);
    closedir(DIR_HANDLE);

    my $file;
    $dir =~ /\/$/ or $dir .= '/';
    foreach $file (@fileList) {
        my $path = "$dir$file";
        if (-d $path) {
            next if $file =~ /^\./; # ignore dirs starting with "."
            next if grep /^$file$/, @ignore;
            $recurse and ScanDir($exifTool, $path, $list);
            next;
        }
        # apply rules from -ext options
        my $accepted;
        if ($filterFlag) {
            $accepted = AcceptFile($file) or next;
            # must be specifically accepted to bypass selection logic
            $accepted &= 0x01;
        }
        unless ($accepted) {
            # read/write this file if it is a recognized type
            if ($scanWritable) {
                if ($scanWritable eq '1') {
                    next unless CanWrite($file);
                } else {
                    my $type = GetFileType($file);
                    next unless defined $type and $type eq $scanWritable;
                }
            } elsif (not GetFileType($file)) {
                next unless $doUnzip;
                next unless $file =~ /\.(gz|bz2)$/i;
            }
        }
        $list and push(@$list, $path), next;
        GetImageInfo($exifTool, $path);
    }
    ++$countDir;
}

#------------------------------------------------------------------------------
# Add print format entry
# Inputs: 0) expression string
sub AddPrintFormat($)
{
    my $expr = shift;
    my $type;
    if ($expr =~ /^#/) {
        $expr =~ s/^#\[(HEAD|BODY|TAIL)\]// or return; # ignore comments
        $type = $1;
    } else {
        $type = 'BODY';
    }
    $printFmt{$type} or $printFmt{$type} = [ ];
    push @{$printFmt{$type}}, $expr;
    # add to list of requested tags
    push @tags, $expr =~ /\$((?:[-\w]+:)*[-\w]+#?)/g;
    # tags contained in braces too...
    push @tags, $expr =~ /\$\{((?:[-\w]+:)*[-\w]+#?)\}/g;
}

#------------------------------------------------------------------------------
# Load print format file
# Inputs: 0) file name
# - saves lines of file to %printFmt list
# - adds tag names to @tags list
sub LoadPrintFormat($)
{
    my $arg = shift || Die "Must specify file or expression for -p option\n";
    if (-f $arg and open(FMT_FILE, "<$arg")) {
        foreach (<FMT_FILE>) {
            AddPrintFormat($_);
        }
        close(FMT_FILE);
    } else {
        AddPrintFormat($arg . "\n");
    }
}

#------------------------------------------------------------------------------
# A sort of sprintf for filenames
# Inputs: 0) format string (%d=dir, %f=file name, %e=ext),
#         1) source filename or undef to test format string
# Returns: new filename or undef on error (or if no file and fmt contains token)
sub FilenameSPrintf($;$)
{
    my ($fmt, $file) = @_;
    # return format string straight away if no tokens
    return $fmt unless $fmt =~ /%[-+]?\d*\.?\d*[lu]?[dfe]/;
    return undef unless defined $file;
    CleanFilename($file);   # make sure we are using forward slashes
    # split filename into directory, file, extension
    my @parts = ($file =~ /^(.*?)([^\/]*?)(\.[^.\/]*)?$/);
    $parts[2] = $parts[2] ? substr($parts[2], 1) : '';
    @parts or Warn("Error: Bad pattern match for file $file\n"), return undef;
    my %part;
    foreach ('d','f','e') {
        $part{$_} = shift @parts;
    }
    my ($filename, $pos) = ('', 0);
    while ($fmt =~ /(%([-+]?)(\d*)\.?(\d*)([lu]?)([dfe]))/g) {
        $filename .= substr($fmt, $pos, pos($fmt) - $pos - length($1));
        $pos = pos($fmt);
        my ($sign, $wid, $skip, $mod, $code) = ($2, $3, $4 || 0, $5, $6);
        my $len = length $part{$code};
        next unless $skip < $len;
        $wid = $len - $skip if $wid eq '' or $wid + $skip > $len;
        $skip = $len - $wid - $skip if $sign eq '-';
        my $part = substr($part{$code}, $skip, $wid);
        $part = ($mod eq 'u') ? uc($part) : lc($part) if $mod;
        $filename .= $part;
    }
    $filename .= substr($fmt, $pos); # add rest of file name
    $filename =~ s{//}{/}g; # remove double slashes
    return $filename;
}

#------------------------------------------------------------------------------
# Convert number to alphabetical index: a, b, c, ... z, aa, ab ...
# Inputs: 0) number
# Returns: alphabetical index string
sub Num2Alpha($)
{
    my $num = shift;
    my $alpha = chr(97 + ($num %26));
    while ($num >= 26) {
        $num = int($num / 26) - 1;
        $alpha = chr(97 + ($num % 26)) . $alpha;
    }
    return $alpha;
}

#------------------------------------------------------------------------------
# Expand '%c' and '%C' codes if filename to get next unused file name
# Inputs: 0) file name format string, 1) filename ok to use even if it exists
# Returns: new file name
sub NextUnusedFilename($;$)
{
    my ($fmt, $okfile) = @_;
    return $fmt unless $fmt =~ /%[-+]?\d*\.?\d*[lun]?[cC]/;
    my %sep = ( '-' => '-', '+' => '_' );
    my ($copy, $alpha) = (0, 'a');
    for (;;) {
        my ($filename, $pos) = ('', 0);
        while ($fmt =~ /(%([-+]?)(\d*)(\.?)(\d*)([lun]?)([cC]))/g) {
            $filename .= substr($fmt, $pos, pos($fmt) - $pos - length($1));
            $pos = pos($fmt);
            my ($sign, $wid, $dec, $wid2, $mod, $tok) = ($2, $3 || 0, $4, $5 || 0, $6, $7);
            if ($tok eq 'C') {
                $seqFileNum = $wid if $wid and not $seqFileNum;
                $wid = $wid2;
            } else {
                next unless $dec or $copy;
                $wid = $wid2 if $wid < $wid2;
            }
            # add dash or underline separator if '-' or '+' specified
            $filename .= $sep{$sign} if $sign;
            if ($mod and $mod ne 'n') {
                my $a = $tok eq 'C' ? Num2Alpha($seqFileNum++) : $alpha;
                my $str = ($wid and $wid > length $a) ? 'a' x ($wid - length($a)) : '';
                $str .= $a;
                $str = uc $str if $mod eq 'u';
                $filename .= $str;
            } else {
                my $c = $tok eq 'C' ? $seqFileNum++ : $copy;
                my $num = $c + ($mod ? 1 : 0);
                $filename .= $wid ? sprintf("%.${wid}d",$num) : $num;
            }
        }
        $filename .= substr($fmt, $pos); # add rest of file name
        # return now with filename unless file exists
        return $filename unless -e $filename;
        return $filename if defined $okfile and $filename eq $okfile;
        ++$copy;
        ++$alpha;
    }
}

#------------------------------------------------------------------------------
# Create directory for specified file
# Inputs: 0) complete file name including path
# Returns: true if a directory was created (dies if dir can't be created)
sub CreateDirectory($)
{
    my $file = shift;
    my ($dir, $created);
    ($dir = $file) =~ s/[^\/]*$//;  # remove filename from path specification
    if ($dir and not -d $dir) {
        my @parts = split /\//, $dir;
        $dir = '';
        foreach (@parts) {
            $dir .= $_;
            if (length $dir and not -d $dir) {
                # create directory since it doesn't exist
                mkdir($dir, 0777) or Die "Error creating directory $dir\n";
                $verbose and print "Created directory $dir\n";
                $created = 1;
            }
            $dir .= '/';
        }
    }
    ++$countNewDir if $created;
    return $created;
}

#------------------------------------------------------------------------------
# Open output text file
# Inputs: 0) file name format string
# Returns: 0) file reference (or undef on error), 1) file name if opened
sub OpenOutputFile($)
{
    my $file = shift;
    my ($fp, $outfile);
    if ($outputExt) {
        $outfile = $file;
        CleanFilename($outfile);
        if ($outputExt =~ /%[-+]?\d*\.?\d*[lun]?[dfecC]/) {
            # make filename from printf-like $outputExt
            $outfile = FilenameSPrintf($outputExt, $file);
            return () unless defined $outfile;
            $outfile = NextUnusedFilename($outfile);
            CreateDirectory($outfile);  # create directory if necessary
        } else {
            $outfile =~ s/\.[^.\/]*$//; # remove extension if it exists
            $outfile .= $outputExt;
        }
        if (-e $outfile) {
            Warn "Output file $outfile already exists for $file\n";
            return ();
        }
        open(OUTFILE, ">$outfile") or Die "Error creating $outfile\n";
        binmode(OUTFILE) if $binaryOutput;
        $fp = \*OUTFILE;
    } else {
        $fp = \*STDOUT;
    }
    return($fp, $outfile);
}

#------------------------------------------------------------------------------
# Filter files based on extension
# Inputs: 0) file name
# Returns: 0 = rejected, 1 = specifically accepted, 2 = accepted by default
# Notes: This routine should only be called if $filterFlag is set
sub AcceptFile($)
{
    my $file = shift;
    my $ext = ($file =~ /.*\.(.+)$/) ? uc($1) : '';
    return $filterExt{$ext} if defined $filterExt{$ext};
    return 0 if $filterFlag & 0x02; # reject if accepting specific extensions
    return 2;   # accept by default
}

#------------------------------------------------------------------------------
# Slurp file into buffer
# Inputs: 0) file name, 1) buffer reference
# Returns: 1 on success
sub SlurpFile($$)
{
    my ($file, $buffPt) = @_;
    open(INFILE, "<$file") or Warn("Error opening file $file\n"), return 0;
    binmode(INFILE);
    my $bsize = 1024 * 1024;
    my $num = read(INFILE, $$buffPt, $bsize);
    unless ($num) {
        close(INFILE);
        Warn("Error reading $file\n");
        return 0;
    }
    my $bmax = 64 * $bsize;
    while ($num == $bsize) {
        $bsize *= 2 if $bsize < $bmax;
        my $buff;
        $num = read(INFILE, $buff, $bsize);
        last unless $num;
        $$buffPt .= $buff;
    }
    close(INFILE);
    return 1;
}

#------------------------------------------------------------------------------
# Print list of tags
# Inputs: 0) message, 1-N) list of tag names
sub PrintTagList($@)
{
    my $msg = shift;
    print $msg, ":\n ";
    my $len = 1;
    my $tag;
    foreach $tag (@_) {
        my $taglen = length($tag);
        if ($len + $taglen > 78) {
            print "\n ";
            $len = 1;
        }
        print " $tag";
        $len += $taglen + 1;
    }
    @_ or print ' [empty list]';
    print "\n";
}

#------------------------------------------------------------------------------
# Get source file name for specified file
# Inputs: 0) file name
sub SourceFile($)
{
    my $file = shift;
    return $file unless $srcFmt;
    return FilenameSPrintf($srcFmt, $file);
}

#------------------------------------------------------------------------------
# Print warnings and errors from info hash
# Inputs: 0) ExifTool object ref, 1) info hash, 2) file name
sub PrintErrors($$$)
{
    my ($exifTool, $info, $file) = @_;
    my ($tag, $key);
    foreach $tag (qw(Warning Error)) {
        next unless $$info{$tag};
        my @keys = ( $tag );
        push @keys, sort(grep /$tag /, keys %$info) if $exifTool->Options('Duplicates');
        foreach $key (@keys) {
            Warn "$tag: $info->{$key} - $file\n";
        }
    }
}

__END__

=head1 NAME

exiftool - Read and write meta information in files

=head1 SYNOPSIS

B<exiftool> [I<OPTIONS>] [-I<TAG>...] [--I<TAG>...] I<FILE>...

B<exiftool> [I<OPTIONS>] -I<TAG>[+-E<lt>]=[I<VALUE>]... I<FILE>...

B<exiftool> [I<OPTIONS>] B<-tagsFromFile> I<SRCFILE>
[-I<SRCTAG>[E<gt>I<DSTTAG>]...] I<FILE>...

B<exiftool> [ B<-ver> | B<-list>[B<w>|B<f>|B<wf>|B<g>[I<NUM>]|B<d>|B<x>] ]

For specific examples, see the L<EXAMPLES|/READING EXAMPLES> sections below.

=head1 DESCRIPTION

A command-line interface to L<Image::ExifTool|Image::ExifTool>, used for
reading and writing meta information in image, audio and video files.
I<FILE> is a source file name, directory name, or C<-> for the standard
input.  Information is read from the source file and output in readable form
to the console (or written to an output text file with the B<-w> option).

To write or copy information, new tag values are specified with the
-I<TAG>=[I<VALUE>] syntax or the B<-tagsFromFile> or B<-geotag> options. 
This causes I<FILE> to be rewritten, and by default the original file is
preserved with C<_original> appended to the file name.  (Be sure to verify
that the new file is OK before erasing the original.)  Once in write mode,
exiftool will ignore any read-specific options.

Note:  If I<FILE> is a directory name, then only file types with recognized
extensions are processed when reading, and only writable types are processed
when any tag is written.  However, a filename may be specified or the
B<-ext> option may be used to force processing of files with any extension.

Below is a list of file types and meta information formats currently
supported by ExifTool (r = read, w = write, c = create):

  File Types
  ------------+-------------+-------------+-------------+------------
  3FR   r     | DOC   r     | K25   r     | PAGES r     | RWZ   r
  3G2   r     | DOCX  r     | KDC   r     | PBM   r/w   | RM    r
  3GP   r     | DVB   r     | KEY   r     | PDF   r/w   | SO    r
  ACR   r     | DYLIB r     | LNK   r     | PEF   r/w   | SR2   r/w
  AFM   r     | EIP   r     | M2TS  r     | PFA   r     | SRF   r
  AI    r/w   | EPS   r/w   | M4A/V r     | PFB   r     | SRW   r/w
  AIFF  r     | ERF   r/w   | MEF   r/w   | PFM   r     | SVG   r
  APE   r     | EXE   r     | MIE   r/w/c | PGM   r/w   | SWF   r
  ARW   r/w   | EXIF  r/w/c | MIFF  r     | PICT  r     | THM   r/w
  ASF   r     | F4A/V r     | MNG   r/w   | PNG   r/w   | TIFF  r/w
  AVI   r     | FLA   r     | MOS   r/w   | PPM   r/w   | TTC   r
  BMP   r     | FLAC  r     | MOV   r     | PPT   r     | TTF   r
  BTF   r     | FLV   r     | MP3   r     | PPTX  r     | VRD   r/w/c
  COS   r     | FPX   r     | MP4   r     | PS    r/w   | WAV   r
  CR2   r/w   | GIF   r/w   | MPC   r     | PSB   r/w   | WDP   r/w
  CRW   r/w   | GZ    r     | MPG   r     | PSD   r/w   | WMA   r
  CS1   r/w   | HDP   r/w   | MPO   r/w   | PSP   r     | WMV   r
  DCM   r     | HTML  r     | MQV   r     | QTIF  r     | X3F   r
  DCP   r/w   | ICC   r/w/c | MRW   r/w   | RA    r     | XLS   r
  DCR   r     | IIQ   r     | NEF   r/w   | RAF   r/w   | XLSX  r
  DFONT r     | IND   r/w   | NRW   r/w   | RAM   r     | XMP   r/w/c
  DIVX  r     | ITC   r     | NUMBERS r   | RAW   r/w   | ZIP   r
  DJVU  r     | JNG   r/w   | OGG   r     | RIFF  r     |
  DLL   r     | JP2   r/w   | ORF   r/w   | RW2   r/w   |
  DNG   r/w   | JPEG  r/w   | OTF   r     | RWL   r/w   |

  Meta Information
  ----------------------+----------------------+---------------------
  EXIF           r/w/c  |  JPEG 2000      r    |  APE            r
  GPS            r/w/c  |  DICOM          r    |  Vorbis         r
  IPTC           r/w/c  |  Flash          r    |  SPIFF          r
  XMP            r/w/c  |  FlashPix       r    |  DjVu           r
  MakerNotes     r/w/c  |  QuickTime      r    |  M2TS           r
  Photoshop IRB  r/w/c  |  GeoTIFF        r    |  PE/COFF        r
  ICC Profile    r/w/c  |  PrintIM        r    |  AVCHD          r
  MIE            r/w/c  |  ID3            r    |  ZIP            r
  JFIF           r/w/c  |  Kodak Meta     r    |  (and more)
  Ducky APP12    r/w/c  |  Ricoh RMETA    r    |
  PDF            r/w/c  |  Picture Info   r    |
  CIFF           r/w    |  Adobe APP14    r    |
  AFCP           r/w    |  MPF            r    |
  PhotoMechanic  r/w    |  Stim           r    |

=head1 OPTIONS

Case is not significant for any command-line option (including tag and group
names), except for single-character options when the corresponding
upper-case option is defined.  Many single-character options have equivalent
long-name versions (shown in brackets), and some options have inverses which
are invoked with a leading double-dash.  Note that multiple single-character
options may NOT be combined into one argument because this would be
interpreted as a tag name.

=head2 Option Summary

  -TAG or --TAG                    Extract or exclude specified tag
  -TAG[+-]=[VALUE]                 Write new value for tag
  -TAG[+-]<=DATFILE                Write tag value from contents of file
  -TAG[+-]<SRCTAG                  Copy tag value (see -tagsFromFile)

  -@ ARGFILE                       Read command-line arguments from file
  -a          (-duplicates)        Allow duplicate tag names in output
  -b          (-binary)            Output data in binary format
  -c FMT      (-coordFormat)       Set format for GPS coordinates
  -charset [[TYPE=]CHARSET]        Specify encoding for special characters
  -d FMT      (-dateFormat)        Set format for date/time values
  -D          (-decimal)           Show tag ID numbers in decimal
  -e          (--composite)        Do not calculate composite tags
  -E, -ex     (-escape(HTML|XML))  Escape values for HTML (-E) or XML (-ex)
  -ee         (-extractEmbedded)   Extract information from embedded files
  -ext EXT    (-extension)         Process files with specified extension
  -f          (-forcePrint)        Force printing of all specified tags
  -F[OFFSET]  (-fixBase)           Fix the base for maker notes offsets
  -fast[NUM]                       Increase speed for slow devices
  -fileOrder [-]TAG                Set file processing order
  -g[NUM...]  (-groupHeadings)     Organize output by tag group
  -G[NUM...]  (-groupNames)        Print group name for each tag
  -geotag TRKFILE                  Geotag images from specified GPS log
  -h          (-htmlFormat)        Use HMTL formatting for output
  -H          (-hex)               Show tag ID number in hexadecimal
  -htmlDump[OFFSET]                Generate HTML-format binary dump
  -i DIR      (-ignore)            Ignore specified directory name
  -if EXPR                         Conditionally process files
  -j          (-json)              Use JSON output format
  -k          (-pause)             Pause before terminating
  -l          (-long)              Use long 2-line output format
  -L          (-latin)             Use Windows Latin1 encoding
  -lang [LANG]                     Set current language
  -list[w|f|wf|g[NUM]|d|x]         List various exiftool attributes
  -m          (-ignoreMinorErrors) Ignore minor errors and warnings
  -n          (--printConv)        Disable print conversion
  -o OUTFILE  (-out)               Set output file or directory name
  -overwrite_original              Overwrite original by renaming tmp file
  -overwrite_original_in_place     Overwrite original by copying tmp file
  -p FMTFILE  (-printFormat)       Print output in specified format
  -P          (-preserve)          Preserve date/time of original file
  -q          (-quiet)             Quiet processing
  -r          (-recurse)           Recursively process subdirectories
  -s          (-short)             Short output format
  -S          (-veryShort)         Very short output format
  -scanForXMP                      Brute force XMP scan
  -sep STR    (-separator)         Set separator string for list items
  -struct                          Use structured XML or JSON output
  -t          (-tab)               Output in tab-delimited list format
  -T          (-table)             Output in tabular format
  -tagsFromFile SRCFILE            Copy tag values from file
  -u          (-unknown)           Extract unknown tags
  -U          (-unknown2)          Extract unknown binary tags too
  -use MODULE                      Add features from plug-in module
  -v[NUM]     (-verbose)           Print verbose messages
  -ver                             Print exiftool version number
  -w EXT      (-textOut)           Write console output to file
  -x TAG      (-exclude)           Exclude specified tag
  -X          (-xmlFormat)         Use RDF/XML output format
  -z          (-zip)               Read/write compressed information

  -common_args                     Define common arguments
  -config CFGFILE                  Specify configuration file name
  -execute                         Execute multiple commands on one line
  -srcfile FMT                     Set different source file name

=head2 Option Details

=over 5

=item B<->I<TAG>

Extract information for specified tag (ie. C<-CreateDate>).  A tag name
is the handle by which a piece of information is referenced.  See
L<Image::ExifTool::TagNames|Image::ExifTool::TagNames> for documentation on
available tag names.  A tag name may include leading group names separated
by colons (ie. C<-EXIF:CreateDate>, or C<-Doc1:XMP:Creator>), and each group
name may be prefixed by a digit to specify family number (ie.
C<-1IPTC:City>).  Use the B<-listg> option to list available group names by
family.

A special tag name of C<All> may be used to indicate all meta information.
This is particularly useful when a group name is specified to extract all
information in a group.  (C<*> is a synonym for C<All>, but must be quoted
if used on the command line to prevent shell globbing.)

A C<#> may be appended to the tag name to disable the print conversion on a
per-tag basis (see the B<-n> option).  This may also be used when writing or
copying tags.

If no tags are specified, all available information is extracted.

Note:  Descriptions, not tag names, are shown by default when extracting
information.  Use the B<-s> option to see the tag names instead.

=item B<-->I<TAG>

Exclude specified tag from extracted information.  Same as the B<-x> option.
May also be used following a B<-tagsFromFile> option to exclude tags from
being copied, or to exclude groups from being deleted when deleting all
information (ie. C<-all= --exif:all> deletes all but EXIF information).  But
note that this will not exclude individual tags from a group delete.
Instead, the tags must be recovered using the B<-tagsFromFile> option (ie.
C<-all= -tagsfromfile @ -artist>).

=item B<->I<TAG>[+-]B<=>[I<VALUE>]

Write a new value for the specified tag (ie. C<-comment=wow>), or delete the
tag if no I<VALUE> is given (ie. C<-comment=>). C<+=> and C<-=> are used to
add or remove existing entries from a list, or to shift date/time values
(see L<Image::ExifTool::Shift.pl|Image::ExifTool::Shift.pl> for details),
and C<-=> may be used to conditionally remove or replace a tag (see
L</WRITING EXAMPLES> for examples).

I<TAG> may contain a leading family 0 or 1 group name separated by a colon.
If no group name is specified, the tag is created in the preferred group,
and updated in any other location where a same-named tag already exists. 
The preferred group is the first group in the following list where I<TAG> is
valid: 1) EXIF, 2) IPTC, 3) XMP.

The special C<All> tag may be used in this syntax only if a I<VALUE> is NOT
given.  This causes all meta information to be deleted (or all information
in a group if C<-GROUP:All=> is used).  Note that not all groups are
deletable.  Use the B<-listd> option for a complete list of deletable
groups.  Also, within an image some groups may be contained within others,
and these groups are removed if the containing group is deleted:

  JPEG Image:
  - Deleting EXIF or IFD0 also deletes ExifIFD, GlobParamIFD,
    GPS, IFD1, InteropIFD, MakerNotes, PrintIM and SubIFD.
  - Deleting ExifIFD also deletes InteropIFD and MakerNotes.
  - Deleting Photoshop also deletes IPTC.

  TIFF Image:
  - Deleting EXIF only removes ExifIFD which also deletes
    InteropIFD and MakerNotes.

Note:  MakerNotes tags may be edited, but not created or deleted
individually. This avoids many potential problems including the inevitable
compatibility problems with OEM software which may be very inflexible about
the information it expects to find in the maker notes.

=item B<->I<TAG>E<lt>=I<DATFILE> or B<->I<TAG>E<lt>=I<FMT>

Set the value of a tag from the contents of file I<DATFILE>.  The file name
may also be given by a I<FMT> string where %d, %f and %e represent the
directory, file name and extension of the original I<FILE> (see the B<-w>
option for more details).  Note that quotes are required around this
argument to prevent shell redirection since it contains a C<E<lt>> symbol.
C<+E<lt>=> or C<-E<lt>=> may also be used to add or delete specific list
entries, or to shift date/time values.

=item B<-@> I<ARGFILE>

Read command-line arguments from the specified file.  The file contains one
argument per line (NOT one option per line -- some options require
additional arguments which must be placed on separate lines).  Blank lines
and lines beginning with C<#> and are ignored.  Normal shell processing of
arguments is not performed, which among other things means that arguments
should not be quoted.  I<ARGFILE> may exist relative to either the current
directory or the exiftool directory unless an absolute pathname is given.

For example, the following I<ARGFILE> will set the value of Copyright to
"Copyright YYYY, Phil Harvey", where "YYYY" is the year of CreateDate:

    -d
    %Y
    -copyright<Copyright $createdate, Phil Harvey

=item B<-a>, B<--a> (B<-duplicates>, B<--duplicates>)

Allow (B<-a>) or suppress (B<--a>) duplicate tag names in the output.  By
default, duplicate tags are suppressed unless the B<-ee> or B<-X> options
are used or the Duplicates option is enabled in the configuration file.

=item B<-b> (B<-binary>)

Output requested data in binary format without tag names or descriptions.
This option is mainly used for extracting embedded images or other binary
data, but it may also be useful for some text strings since control
characters (such as newlines) are not replaced by '.' as they are in the
default output.  Also valid in combination with the C<-X> option.

=item B<-c> I<FMT> (B<-coordFormat>)

Set the print format for GPS coordinates.  I<FMT> uses the same syntax as
the C<printf> format string.  The specifiers correspond to degrees, minutes
and seconds in that order, but minutes and seconds are optional.  For
example, the following table gives the output for the same coordinate using
various formats:

            FMT                  Output
    -------------------    ------------------
    "%d deg %d' %.2f"\"    54 deg 59' 22.80"  (default for reading)
    "%d %d %.8f"           54 59 22.80000000  (default for copying)
    "%d deg %.4f min"      54 deg 59.3800 min
    "%.6f degrees"         54.989667 degrees

Note:  To avoid loss of precision, the default coordinate format is
different when copying tags using the B<-tagsFromFile> option.

=item B<-charset> [[I<TYPE>=]I<CHARSET>]

If I<TYPE> is C<ExifTool> or not specified, this option sets the ExifTool
character encoding for output tag values when reading and input values when
writing.  The default ExifTool encoding is C<UTF8>.  I<TYPE> may also be
C<ID3> to specify the internal encoding of ID3v1 information, or C<IPTC> to
set the internal IPTC encoding when IPTC:CodedCharacterSet is not defined. 
The default ID3 and IPTC charsets are C<Latin>.  If no I<CHARSET> is given,
a list of available character sets is returned.  See
L<http://owl.phy.queensu.ca/~phil/exiftool/faq.html#Q10> for more
information about character sets.  Valid I<CHARSET> values are:

     CHARSET       Alias(es)                Description
    ----------  ---------------  ----------------------------------
    UTF8        cp65001, UTF-8   UTF-8 characters
    Latin       cp1252, Latin1   Windows Latin1 (West European)
    Latin2      cp1250           Windows Latin2 (Central European)
    Cyrillic    cp1251, Russian  Windows Cyrillic
    Greek       cp1253           Windows Greek
    Turkish     cp1254           Windows Turkish
    Hebrew      cp1255           Windows Hebrew
    Arabic      cp1256           Windows Arabic
    Baltic      cp1257           Windows Baltic
    Vietnam     cp1258           Windows Vietnamese
    Thai        cp874            Windows Thai
    MacRoman    cp10000, Roman   Macintosh Roman
    MacLatin2   cp10029          Macintosh Latin2 (Central Europe)
    MacCyrillic cp10007          Macintosh Cyrillic
    MacGreek    cp10006          Macintosh Greek
    MacTurkish  cp10081          Macintosh Turkish
    MacRomanian cp10010          Macintosh Romanian
    MacIceland  cp10079          Macintosh Icelandic
    MacCroatian cp10082          Macintosh Croatian

=item B<-d> I<FMT> (B<-dateFormat>)

Set the format for date/time tag values.  Consult C<strftime> man page for
I<FMT> syntax. The default format is equivalent to "%Y:%m:%d %H:%M:%S". 
This option has no effect on date-only or time-only tags and ignores
timezone information if present.  Only one B<-d> option may be used per
command.  The inverse operation (ie. un-formatting a date/time value) is
currently not applied when writing a date/time tag.

=item B<-D> (B<-decimal>)

Show tag ID number in decimal when extracting information.

=item B<-e> (B<--composite>)

Print existing tags only -- don't calculate composite tags.

=item B<-E>, B<-ex> (B<-escapeHTML>, B<-escapeXML>)

Escape characters in output values for HTML (B<-E>) or XML (B<-ex>).  For
HTML, all characters with Unicode code points above U+007F are escaped as
well as the following 5 characters: & (&amp;) E<39> (&#39;) E<quot> (&quot;)
E<gt> (&gt;) and E<lt> (&lt;).  For XML, only these 5 characters are
escaped.  The B<-E> option is implied with B<-h>, and B<-ex> is implied with
B<-X>.  The inverse conversion is applied when writing tags.

=item B<-ee> (B<-extractEmbedded>)

Extract information from embedded documents in EPS and PDF files, embedded
MPF images in JPEG and MPO files, streaming metadata from AVCHD videos, and
the resource fork of Macintosh files.  Implies the B<-a> option.  Use B<-g3>
or B<-G3> to identify the originating document for extracted information.
Embedded documents containing sub-documents are indicated with dashes in the
family 3 group name.  (ie. C<Doc2-3> is the 3rd sub-document of the 2nd
embedded document.)

=item B<-ext> I<EXT>, B<--ext> I<EXT> (B<-extension>)

Process only files with (B<-ext>) or without (B<--ext>) a specified
extension.  There may be multiple B<-ext> and B<--ext> options.  Extensions
may begin with a leading '.', and case is not significant.  For example:

    exiftool -ext .JPG DIR            # process only JPG files
    exiftool --ext crw --ext dng DIR  # process all but CRW and DNG
    exiftool --ext . DIR              # ignore if no extension

=item B<-f> (B<-forcePrint>)

Force printing of tags even if their values are not found.  This option only
applies when tag names are specified.  May also be used to add a 'flags'
attribute to the B<-listx> output.

=item B<-F>[I<OFFSET>] (B<-fixBase>)

Fix the base for maker notes offsets.  A common problem with some image
editors is that offsets in the maker notes are not adjusted properly when
the file is modified.  This may cause the wrong values to be extracted for
some maker note entries when reading the edited file.  This option allows an
integer I<OFFSET> to be specified for adjusting the maker notes base offset.
If no I<OFFSET> is given, ExifTool takes its best guess at the correct base.
Note that exiftool will automatically fix the offsets for images which store
original offset information (ie. newer Canon models).  Offsets are fixed
permanently if B<-F> is used when writing EXIF to an image. ie)

    exiftool -F -exif:resolutionunit=inches image.jpg

=item B<-fast>[I<NUM>]

Increase speed of extracting information from JPEG images.  With this
option, ExifTool will not scan to the end of a JPEG image to check for an
AFCP or PreviewImage trailer, or past the first comment in GIF images or the
audio/video data in WAV/AVI files to search for additional metadata.  These
speed benefits are small when reading images directly from disk, but can be
substantial if piping images through a network connection.  For more
substantial speed benefits, B<-fast2> also causes exiftool to avoid
extracting any EXIF MakerNote information.

=item B<-fileOrder> [-]I<TAG>

Set file processing order according to the sorted value of the specified
I<TAG>.  For example, to process files in order of date:

    exiftool -fileOrder DateTimeOriginal DIR

Additional B<-fileOrder> options may be added as secondary sort keys. 
Floating point values are sorted numerically, and all other values are
sorted alphabetically.  The sort order may be reversed by prefixing the tag
name with a C<-> (ie. C<-fileOrder -createdate>).  Note that this option has
a large performance impact since it involves an additional processing pass
of each file.

=item B<-g>[I<NUM>][:I<NUM>...] (B<-groupHeadings>)

Organize output by tag group.  I<NUM> specifies a group family number, and
may be 0 (general location), 1 (specific location), 2 (category), 3
(document number) or 4 (instance number).  Multiple families may be
specified by separating them with colons.  By default the resulting group
name is simplified by removing any leading C<Main:> and collapsing adjacent
identical group names, but this can avoided by placing a colon before the
first family number (ie. B<-g:3:1>).  If I<NUM> is not specified, B<-g0> is
assumed.  Use the B<-listg> option to list group names for a specified
family.

=item B<-G>[I<NUM>][:I<NUM>...] (B<-groupNames>)

Same as B<-g> but print group name for each tag.

=item B<-geotag> I<TRKFILE>

Geotag images from the specified GPS track log file.  Using the B<-geotag>
option is equivalent to writing a value to the C<Geotag> tag.  After the
B<-geotag> option has been specified, the value of the C<Geotime> tag is
written to define a date/time for the position interpolation.  If C<Geotime>
is not specified, the value is copied from C<DateTimeOriginal>.  For
example, the following two commands are equivalent:

    exiftool -geotag track.log image.jpg
    exiftool -geotag "-Geotime<DateTimeOriginal" image.jpg

When the C<Geotime> value is converted to UTC, the local system timezone is
assumed unless the date/time value contains a timezone.  Writing C<Geotime>
causes the following 8 EXIF tags to be created:  GPSLatitude,
GPSLatitudeRef, GPSLongitude, GPSLongitudeRef, GPSAltitude, GPSAltitudeRef,
GPSDateStamp and GPSTimeStamp.  Alternately C<XMP:Geotime> may be written to
create the following 5 XMP tags: GPSLatitude, GPSLongitude, GPSAltitude,
GPSAltitudeRef and GPSDateTime.

The C<Geosync> tag may be used to specify a time correction which is applied
to each C<Geotime> value for synchronization with GPS time.  For example,
the following command compensates for image times which are 1 minute and 20
seconds behind GPS:

    exiftool -geosync=+1:20 -geotag a.log DIR

Multiple B<-geotag> options may be used to concatinate GPS track log data.
Also, a single B<-geotag> option may be used to load multiple track log
files by using wildcards in the I<TRKFILE> name, but note that in this case
I<TRKFILE> must be quoted on most systems (with the notable exception of
Windows) to prevent filename expansion.  For example:

    exiftool -geotag "TRACKDIR/*.log" IMAGEDIR

Currently supported track file formats are GPX, NMEA RMC/GGA/GLL, KML, IGC,
Garmin XML and TCX, and Magellan PMGNTRK.  See L</GEOTAGGING EXAMPLES> for
examples.  Also see "geotag.html" in the full ExifTool distribution and the
L<Image::ExifTool Options|Image::ExifTool/Options> for more details and
for information about geotag configuration options.

=item B<-h> (B<-htmlFormat>)

Use HTML table formatting for output.  Implies the B<-E> option.  The
formatting options B<-D>, B<-H>, B<-g>, B<-G>, B<-l> and B<-s> may be used
in combination with B<-h> to influence the HTML format.

=item B<-H> (B<-hex>)

Show tag ID number in hexadecimal when extracting information.

=item B<-htmlDump>[I<OFFSET>]

Generate a dynamic web page containing a hex dump of the EXIF information.
This can be a very powerful tool for low-level analysis of EXIF information.
The B<-htmlDump> option is also invoked if the B<-v> and B<-h> options are
used together.  The verbose level controls the maximum length of the blocks
dumped.  An I<OFFSET> may be given to specify the base for displayed
offsets.  If not provided, the EXIF/TIFF base offset is used.  Use
B<-htmlDump0> for absolute offsets.  Currently only EXIF/TIFF and JPEG
information is dumped, but the -u option can be used to give a raw hex dump
of other file formats.

=item B<-i> I<DIR> (B<-ignore>)

Ignore specified directory name.  May be multiple B<-i> options.

=item B<-if> I<EXPR>

Specify a condition to be evaluated before processing each I<FILE>.  I<EXPR>
is a Perl-like expression containing tag names prefixed by C<$> symbols.  It
is evaluated with the tags from each I<FILE> in turn, and the file is
processed only if the expression returns true.  Unlike Perl variable names,
tag names are not case sensitive and may contain a hyphen.  As well, tag
names may have a leading group name separated by a colon, and/or a trailing
C<#> character to disable print conversion.  When multiple B<-if> options
are used, all conditions must be satisfied to process the file. Returns an
exit status of 1 if all files fail the condition.  Below are a few examples:

    # extract shutterspeed from all Canon images in a directory
    exiftool -shutterspeed -if '$make eq "Canon"' dir

    # add one hour to all images created on or after Apr. 2, 2006
    exiftool -alldates+=1 -if '$CreateDate ge "2006:04:02"' dir

    # set EXIF ISO value if possible, unless it is set already
    exiftool '-exif:iso<iso' -if 'not $exif:iso' dir

    # find images containing a specific keyword (case insensitive)
    exiftool -if '$keywords =~ /harvey/i' -filename dir

=item B<-j> (B<-json>)

Use JSON (JavaScript Object Notation) formatting for console output.  This
option may be combined with B<-g> to organize the output into objects by
group, or B<-G> to add group names to each tag.  List-type tags with
multiple items are output as JSON arrays unless B<-sep> is used.  By default
XMP structures are flattened into individual tags in the JSON output, but
the original structure may be preserved with the B<-struct> option (this
also causes all List-type XMP tags to be output as JSON arrays, while
without this option single-item lists are output as simple strings).  The
B<-a> option is implied if the B<-g> or B<-G> options are used, otherwise it
is ignored and duplicate tags are suppressed.  The B<-b>, B<-L> and
B<-charset> options have no effect on the JSON output.

=item B<-k> (B<-pause>)

Pause with the message C<-- press any key --> before terminating.  This
option is used to prevent the command window from closing when run as a
Windows drag and drop application.

=item B<-l> (B<-long>)

Use long 2-line Canon-style output format.  Adds a description and
unconverted value to the XML output when B<-X> is used.

=item B<-L> (B<-latin>)

Use Windows Latin1 encoding (cp1252) for output tag values instead of the
default UTF-8.  When writing, B<-L> specifies that input text values are
Latin1 instead of UTF-8.  Equivalent to C<-charset latin>.

=item B<-lang> [I<LANG>]

Set current language for tag descriptions and converted values.  I<LANG> is
C<de>, C<fr>, C<ja>, etc.  Use B<-lang> with no other arguments to get a
list of available languages.  The default language is C<en> if B<-lang> is
not specified.  Note that tag/group names are always English, independent of
the B<-lang> setting, and translation of warning/error messages has not yet
been implemented.

By default, ExifTool uses UTF-8 encoding for special characters, but the
the B<-L> or B<-charset> option may be used to invoke other encodings.

Currently, the language support is not complete, but users are welcome to
help improve this by submitting their own translations.  To submit a set of
translations, first use the B<-listx> option and redirect the output to a
file to generate an XML tag database, then add entries for other languages,
zip this file, and email it to phil at owl.phy.queensu.ca for inclusion in
ExifTool.

=item B<-list>, B<-listw>, B<-listf>, B<-listwf>, B<-listg>[I<NUM>],
B<-listd>, B<-listx>

Print a list of all valid tag names (B<-list>), all writable tag names
(B<-listw>), all recognized file extensions (B<-listf>), all writable file
extensions (B<-listwf>), all tag groups [in a specified family]
(B<-listg>[I<NUM>]), all deletable tag groups (B<-listd>), or an XML
database of tag details (B<-listx>).  The B<-list>, B<-listw> and B<-listx>
options may be followed by an additional argument of the form C<-GROUP:All>
to list all tags in a specific group, where C<GROUP> is one or more family
0-2 group names (excepting EXIF IFD groups) separated by colons.  With
B<-listg>, I<NUM> may be given to specify the group family, otherwise family
0 is assumed.  The B<-s> and B<-f> options may be used with B<-listx> to
shorten the output by omitting the descriptions and values, and to add a
'flags' attribute.  Here are some examples:

    -list               # list all tag names
    -list -EXIF:All     # list all EXIF tags
    -list -xmp:time:all # list all XMP tags relating to time
    -listw -XMP-dc:All  # list all writable XMP-dc tags
    -listf              # list all recognized file extensions
    -listwf             # list all writable file extensions
    -listg1             # list all groups in family 1
    -listd              # list all deletable groups
    -listx -EXIF:All    # list database of EXIF tags in XML format
    -listx -XMP:All -s  # list short XML database of XMP tags

Note that none of the B<-list> options require an input I<FILE>.

=item B<-m> (B<-ignoreMinorErrors>)

Ignore minor errors and warnings.  This enables writing to files with minor
errors and disables some validation checks which could result in minor
warnings.

=item B<-n> (B<--printConv>)

Read and write values as numbers instead of words.  By default, extracted
values are converted to a more human-readable format for printing, but the
B<-n> option disables this print conversion for all tags.  For example:

    > exiftool -Orientation -S a.jpg
    Orientation: Rotate 90 CW
    > exiftool -Orientation -S -n a.jpg
    Orientation: 6

The print conversion may also be disabled on a per-tag basis by suffixing
the tag name with a C<#> character:

    > exiftool -Orientation# -Orientation -S a.jpg
    Orientation: 6
    Orientation: Rotate 90 CW

These techniques may also be used to disable the inverse print conversion
when writing.  For example, the following commands all have the same effect:

    > exiftool -Orientation='Rotate 90 CW' a.jpg
    > exiftool -Orientation=6 -n a.jpg
    > exiftool -Orientation#=6 a.jpg

=item B<-o> I<OUTFILE> or I<FMT> (B<-out>)

Set the output file or directory name when writing information.  (Without
this option, the original file is renamed to C<FILE_original> and output is
sent to I<FILE>.)  The output file name may also be specified using a I<FMT>
string in which %d, %f and %e represent the directory, file name and
extension of I<FILE>.  Also, %c may be used to add a copy number.  See the
B<-w> option for I<FMT> string examples.

The output file is taken to be a directory name if it already exists as a
directory or if the name ends with '/'.  Output directories are created if
necessary.  Existing files will not be overwritten.  Combining the
B<-overwrite_original> option with B<-o> causes the original source file to
be erased after the output file is successfully written.

A special feature of this option allows it to be used to create certain
types of files from scratch.  Currently, this can only be done with XMP,
ICC/ICM, MIE, VRD and EXIF files by specifying the appropriate extension for
I<OUTFILE>.  The file is created from a combination of information in
I<FILE> (as if the B<-tagsFromFile> option was used), and tag values
assigned on the command line.  If no I<FILE> is specified, the output file
may be created from scratch using only tags assigned on the command line.

=item B<-overwrite_original>

Overwrite the original I<FILE> (instead of preserving it by adding
C<_original> to the file name) when writing information to an image.
Caution: This option should only be used if you already have separate backup
copies of your image files.  The overwrite is implemented by renaming a
temporary file to replace the original.  This deletes the original file and
replaces it with the edited version in a single operation.  When combined
with B<-o>, this option causes the original file to be deleted if the output
file was successfully written.

=item B<-overwrite_original_in_place>

Similar to B<-overwrite_original> except that an extra step is added to
allow the original file attributes to be preserved.  For example, on a Mac
this causes the original file creation date, ownership, permissions, type,
creator, icon and resource fork to be preserved.  This is implemented by
opening the original file in update mode and replacing its data with a copy
of a temporary file before deleting the temporary.  The extra step results
in slower performance, so the B<-overwrite_original> option should be used
instead unless necessary.

=item B<-p> I<FMTFILE> or I<STR> (B<-printFormat>)

Print output in the format specified by the given file or string (and ignore
other format options).  Tag names in the format file or string begin with a
C<$> symbol and may contain a leading group name and/or a trailing C<#>. 
Case is not significant.  Braces C<{}> may be used around the tag name to
separate it from subsequent text.  Use C<$$> to represent a C<$> symbol, and
C<$/> for a newline.  Multiple B<-p> options may be used, each contributing
a line of text to the output.  Lines beginning with C<#[HEAD]> and
C<#[TAIL]> are output only for the first and last processed files
respectively.  Lines beginning with C<#[BODY]> and lines not beginning with
C<#> are output for each processed file.  Other lines beginning with C<#>
are ignored.  For example, this format file:

    # this is a comment line
    #[HEAD]# Generated by ExifTool $exifToolVersion
    File: $FileName - $DateTimeOriginal
    (f/$Aperture, ${ShutterSpeed}s, ISO $EXIF:ISO)
    #[TAIL]# end

with this command:

    exiftool -p test.fmt a.jpg b.jpg

produces output like this:

    # Generated by ExifTool 8.10
    File: a.jpg - 2003:10:31 15:44:19
    (f/5.6, 1/60s, ISO 100)
    File: b.jpg - 2006:05:23 11:57:38
    (f/8.0, 1/13s, ISO 100)
    # end

When B<-ee> (B<-extractEmbedded>) is combined with B<-p>, embedded documents
are effectively processed as separate input files.

If a specified tag does not exist, a minor warning is issued and the line
with the missing tag is not printed.  However, the B<-f> option may be used
to set the value of missing tags to '-', or the B<-m> option may be used to
ignore minor warnings and leave the missing values empty.

=item B<-P> (B<-preserve>)

Preserve the filesystem modification date/time of the original file
(C<FileModifyDate>) when writing.  Note that some filesystems (ie. Mac and
Windows) store a creation date which is not preserved by this option.  For
these systems, the B<-overwrite_original_in_place> option may be used to
preserve the creation date.

=item B<-q> (B<-quiet>)

Quiet processing.  One B<-q> suppresses normal informational messages, and a
second B<-q> suppresses warnings as well.  Error messages can not be
suppressed, although minor errors may be downgraded to warnings with the
B<-m> option.

=item B<-r> (B<-recurse>)

Recursively process files in subdirectories.  Only meaningful if I<FILE> is
a directory name.

=item B<-s> (B<-short>)

Short output format.  Prints tag names instead of descriptions.  Add up to 3
B<-s> options for even shorter formats:

    -s        - print tag names instead of descriptions
    -s -s     - no extra spaces to column-align values
    -s -s -s  - print values only

Also effective when combined with B<-t>, B<-h>, B<-X> or B<-listx> options.

=item B<-S> (B<-veryShort>)

Very short format.  The same as two B<-s> options.  Extra spaces used to
column-align values are not printed.

=item B<-scanForXMP>

Scan all files (even unrecognized formats) for XMP information unless found
already.  When combined with the B<-fast> option, only unrecognized file
types are scanned.  Warning: It can be time consuming to scan large files.

=item B<-sep> I<STR> (B<-separator>)

Specify separator string for items in List-type tags.  When reading, the
default is ", ".  When writing, this option causes values assigned to
list-type tags to be split into individual items at each substring matching
specified separator.  Space characters in the separator string match zero or
more whitespace characters.

=item B<-struct>

Output structured information instead of flattening to individual tags. 
Effective only for XML and JSON output formats (B<-X> and B<-j>) when
extracting XMP information.

=item B<-t> (B<-tab>)

Output a tab-delimited list of description/values (useful for database
import).  May be combined with B<-s> to print tag names instead of
descriptions, or B<-S> to print tag values only, tab-delimited on a single
line.  The B<-t> option may also be used to add tag table information to the
B<-X> option output.

=item B<-T> (B<-table>)

Output tag values in table form.  (Equivalent to B<-t -S -q -f>.)

=item B<-tagsFromFile> I<SRCFILE> or I<FMT>

Copy tag values from I<SRCFILE> to I<FILE>.  Tag names on the command line
after this option specify the tags to be copied, or excluded from the copy.
If no tags are specified, then all tags from the source file are copied.
More than one B<-tagsFromFile> option may be used to copy tags from multiple
files.

By default, this option will commute information between same-named tags in
different groups and write each tag to the preferred group.  This allows
some information to be automatically translated when copying between images
of different formats.  However, if a group name is specified for a tag then
the information is written to the original group (unless redirected to
another group, see below).  This works even if C<All> is used as a group
name, so C<-All:All> is used to specify that all information be copied to
the same group in the destination file.

I<SRCFILE> may be the same as I<FILE> to move information around within a
file.  In this case, C<@> may be used to represent the source file (ie.
C<-tagsFromFile @>), permitting this feature to be used for batch processing
multiple files (see note 3 below).  Specified tags are then copied from each
file in turn as it is rewritten.  For advanced batch use, the source file
name may also be specified using a I<FMT> string in which %d, %f and %e
represent the directory, file name and extension of I<FILE>.  See B<-w>
option for I<FMT> string examples.

A powerful redirection feature allows a destination tag to be specified for
each extracted tag.  With this feature, information may be written to a tag
with a different name or group.  This is done using
E<quot>'-I<SRCTAG>E<gt>I<DSTTAG>'E<quot> on the command line after
B<-tagsFromFile> (E<quot>'-I<DSTTAG>E<lt>I<SRCTAG>'E<quot> also works).
Note that this argument must be quoted to prevent shell redirection, and
there is no C<=> sign as when assigning new values.  Both source and
destination tags may be prefixed by a group name, and C<All> or C<*> may be
used as a tag or group name.  If no destination group is specified, the
information is written to the preferred group.  As a convenience,
C<-tagsFromFile @> is assumed for any redirected tags which are specified
without a prior B<-tagsFromFile> option.  Copied tags may also be added or
deleted from a list with arguments of the form
E<quot>'-I<SRCTAG>+E<gt>I<DSTTAG>'E<quot> or
E<quot>'-I<SRCTAG>-E<gt>I<DSTTAG>'E<quot>.

An extension of the redirection feature allows strings involving tag names
to be used on the right hand side of the C<E<lt>> symbol with the syntax
E<quot>'-I<DSTTAG>E<lt>I<STR>'E<quot>, where tag names in I<STR> are
prefixed with a C<$> symbol.  See the B<-p> option for more details about
this syntax.  Strings starting with a C<=> sign must insert a single space
after the C<E<lt>> to avoid confusion with the C<E<lt>=> syntax which would
otherwise attempt to set the tag value from the contents of a file.  A
single space at the start of the string is removed if it exists, but all
other whitespace is preserved.

See L</COPYING EXAMPLES> for examples using B<-tagsFromFile>.

Notes:

1) Be aware of the difference between excluding a tag from being copied
(--I<TAG>), and deleting a tag (-I<TAG>=).  Excluding a tag prevents it from
being copied to the destination image, but deleting will remove a
pre-existing tag from the image.

2) The maker note information is copied as a block, so it isn't affected
like other information by subsequent tag assignments on the command line.
Also, since the PreviewImage referenced from the maker notes may be rather
large, it is not copied, and must be transferred separately if desired.

3) When performing complex batch processing, it is important to note that
the order of operations is different for tags copied in batch mode.  In
general, tags are copied from batch-mode files after all other command-line
arguments have been applied.  For example, the following two commands are
not equivalent:

    # (not batch mode):  Sets xmp:title to 'NEW'
    exiftool -tagsfromfile a.jpg -xmp:title -xmp:title=NEW a.jpg

    # (batch mode):  Preserves original title if it exists
    exiftool -tagsfromfile @ -xmp:title -xmp:title=NEW a.jpg

4) The normal behaviour of copied tags differs subtly from that of assigned
tags for List-type tags.  When copying to a list, each copied tag overrides
any previous operations on the list.  While this avoids duplicate list items
when copying groups of tags from a file containing redundant information, it
also prevents values of different tags from being copied into the same list
when this is the intent.  So a B<-addTagsFromFile> option is provided which
allows copying of multiple tags into the same list.  ie)

    exiftool -addtagsfromfile @ '-subject<make' '-subject<model' ...

Other than this difference, the B<-tagsFromFile> and B<-addTagsFromFile>
options are equivalent.

=item B<-u> (B<-unknown>)

Extract values of unknown tags.  Add another B<-u> to also extract unknown
information from binary data blocks.  This option applies to tags with
numerical tag ID's, and causes tag names like "Exif_0xc5d9" to be generated
for unknown information.  It has no effect on information types which have
human-readable tag ID's (such as XMP), since unknown tags are extracted
automatically from these formats.

=item B<-U> (B<-unknown2>)

Extract values of unknown tags as well as unknown information from some
binary data blocks.  This is the same as two B<-u> options.

=item B<-use> I<MODULE>

Add features from specified plug-in I<MODULE>.  Currently, the MWG module is
the only plug-in module distributed with exiftool.  This module adds
read/write support for tags as recommended by the Metadata Working Group. 
To save typing, C<-use MWG> is assumed if the C<MWG> group is specified for
any tag on the command line.  See the
L<MWG Tags documentation|Image::ExifTool::TagNames/MWG Tags> for more
details.

=item B<-v>[I<NUM>] (B<-verbose>)

Print verbose messages.  I<NUM> specifies the level of verbosity in the
range 0-5, with higher numbers being more verbose.  If I<NUM> is not given,
then each B<-v> option increases the level of verbosity by 1.  With any
level greater than 0, most other options are ignored and normal console
output is suppressed unless specific tags are extracted.  Using B<-v0>
causes the console output buffer to be flushed after each line (which may be
useful to avoid delays when piping exiftool output), and prints the name of
each processed file when writing.

=item B<-ver>

Print exiftool version number.

=item B<-w> I<EXT> or I<FMT> (B<-textOut>)

Write console output to a file with name ending in I<EXT> for each source
file.  The output file name is obtained by replacing the source file
extension (including the '.') with the specified extension (and a '.' is
added to the start of I<EXT> if it doesn't already contain one). 
Alternatively, a I<FMT> string may be used to give more control over the
output file name and directory.  In the format string, %d, %f and %e
represent the directory, filename and extension of the source file, and %c
represents a copy number which is automatically incremented if the file
already exists.  %d includes the trailing '/' if necessary, but %e does not
include the leading '.'.  For example:

    -w %d%f.txt       # same effect as "-w txt"
    -w dir/%f_%e.out  # write files to "dir" as "FILE_EXT.out"
    -w dir2/%d%f.txt  # write to "dir2", keeping dir structure
    -w a%c.txt        # write to "a.txt" or "a1.txt" or "a2.txt"...

Existing files will not be overwritten, and output directories are created
automatically if necessary.

Notes:

1) In a Windows BAT file the C<%> character is represented by C<%%>, so an
argument like C<%d%f.txt> is written as C<%%d%%f.txt>.

2) It is not possible to specify a simple filename as an argument for B<-w>.
Instead, this simple case is accomplished using shell redirection:

    exiftool FILE > out.txt

Advanced features:  A substring of the original file name, directory or
extension may be taken by specifying a field width immediately following the
'%' character.  If the width is negative, the substring is taken from the
end.  The substring position (characters to ignore at the start or end of
the string) may be given by a second optional value after a decimal point.
For example:

    Input File Name     Format Specifier    Output File Name
    ----------------    ----------------    ----------------
    Picture-123.jpg     %7f.txt             Picture.txt
    Picture-123.jpg     %-.4f.out           Picture.out
    Picture-123.jpg     %7f.%-3f            Picture.123
    Picture-123a.jpg    Meta%-3.1f.txt      Meta123.txt

For %c, these modifiers have a different effects.  If a field width is
given, the copy number is padded with zeros to the specified width.  A
leading '-' adds a dash before the copy number, and a '+' adds an underline.
By default, a copy number of zero is omitted, but this can be changed by
adding a decimal point to the modifier.  For example:

    -w A%-cZ.txt      # AZ.txt, A-1Z.txt, A-2Z.txt ...
    -w B%5c.txt       # B.txt, B00001.txt, B00002.txt ...
    -w C%.c.txt       # C0.txt, C1.txt, C2.txt ...
    -w D%-.c.txt      # D-0.txt, D-1.txt, D-2.txt ...
    -w E%-.4c.txt     # E-0000.txt, E-0001.txt, E-0002.txt ...
    -w F%-.4nc.txt    # F-0001.txt, F-0002.txt, F-0003.txt ...
    -w G%+c.txt       # G.txt, G_1.txt G_2.txt ...
    -w H%-lc.txt      # H.txt, H-b.txt, H-c.txt ...

A special feature allows the copy number to be incremented for each
processed file by using %C (upper case) instead of %c.  This allows a
sequential number to be added to output file names, even if the names are
different.  For %C, the number before the decimal place gives the starting
index, and the number after the decimal place gives the field width.  The
following examples show the output filenames when used with the command
C<exiftool rose.jpg star.jpg jet.jpg ...>:

    -w %C%f.txt       # 0rose.txt, 1star.txt, 2jet.txt
    -w %f-%10C.txt    # rose-10.txt, star-11.txt, jet-12.txt
    -w %.3C-%f.txt    # 000-rose.txt, 001-star.txt, 002-jet.txt
    -w %57.4C%f.txt   # 0057rose.txt, 0058star.txt, 0059jet.txt

All format codes may be modified by 'l' or 'u' to specify lower or upper
case respectively (ie. C<%le> for a lower case file extension).  When used
to modify %c or %C, the numbers are changed to an alphabetical base (see
example H above).  Also, %c may be modified by 'n' to count using natural
numbers starting from 1, instead of 0 (see example F).

This same I<FMT> syntax is used with the B<-o> and B<-tagsFromFile> options,
although %c is only valid for output file names.

=item B<-x> I<TAG> (B<-exclude>)

Exclude the specified tag.  There may be multiple B<-x> options.  This has
the same effect as --I<TAG> on the command line.  May also be used following
a B<-tagsFromFile> option to exclude tags from being copied.

=item B<-X> (B<-xmlFormat>)

Use RDF/XML formatting for console output.  Implies the B<-a> option, so
duplicate tags are extracted.  The formatting options B<-b>, B<-D>, B<-H>,
B<-l>, B<-s>, B<-sep>, B<-struct> and B<-t> may be used in combination with
B<-X> to affect the output, but note that the tag ID (B<-D>, B<-H> and
B<-t>), binary data (B<-b>) and structured output (B<-struct>) options are
not effective for the short output (B<-s>).  Another restriction of B<-s> is
that only one tag with a given group and name may appear in the output. 
Note that the tag ID options (B<-D>, B<-H> and B<-t>) will produce
non-standard RDF/XML unless the B<-l> option is also used.  By default,
list-type tags with multiple values are formatted as an RDF Bag, but they
are combined into a single string when B<-s> or B<-sep> is used.  Using
B<-L> changes the XML encoding from "UTF-8" to "windows-1252".  Other
B<-charset> settings change the encoding only if there is a corresponding
standard XML character set.  The B<-b> option causes binary data values to
be written, encoded in base64 if necessary.  The B<-t> option adds tag table
information to the output (table C<name>, decimal tag C<id>, and C<index>
for cases where multiple conditional tags exist with the same ID).

=item B<-z> (B<-zip>)

When reading, causes information to be extracted from .gz and .bz2
compressed images.  (Only one image per archive. Requires gzip and bzip2 to
be installed on the system.)  When writing, causes compressed information to
be written if supported by the image format.  (ie. The PNG format supports
compressed text.)

=back

=head3 Advanced Options

Among other things, the advanced options allow complex processing to be
performed from a single command without the need for additional scripting.
This may be particularly useful for implementations such as Windows
drag-and-drop applications.  These options may also be used to improve
performance in multi-pass processing by reducing the overhead required to
load exiftool for each invocation.

=over 5

=item B<-common_args>

Specifies that all arguments following this option are common to all
executed commands when B<-execute> is used.  This and the B<-config> option
are the only options that may not be used inside a B<-@> I<ARGFILE>.

=item B<-config> I<CFGFILE>

Load specified configuration file instead of the default ".ExifTool_config".
If used, this option must come before all other arguments on the command
line.  The I<CFGFILE> name must include the full path specification, or may
be set to an empty string ("") to disable loading of the config file.  See
the sample configuration file and "config.html" in the full ExifTool
distribution for more information about the ExifTool configuration file.

=item B<-execute>

Execute command for all arguments up to this point on the command line.
Allows multiple commands to be executed from a single command line.

=item B<-srcfile> I<FMT>

Specify a different source file to be processed based on the name of the
original file.  This may be useful in some special situations for processing
related preview images or sidecar files.  See the B<-w> option for a
description of the I<FMT> syntax.  Note that file name I<FMT> strings for
all options are based on the original file name specified on the command
line, not the name of the source file specified by B<-srcfile>.

=back

=head1 READING EXAMPLES

B<Note>: Beware when cutting and pasting these examples into your terminal!
Some characters such as single and double quotes and hyphens may have been
changed into similar-looking but functionally-different characters by the
text formatter used to display this documentation.

=over 5

=item exiftool -a -u -g1 a.jpg

Print all meta information in an image, including duplicate and unknown
tags, sorted by group (for family 1).

=item exiftool -common dir

Print common meta information for all images in C<dir>.

=item exiftool -T -createdate -aperture -shutterspeed -iso dir > out.txt

List meta information in tab-delimited column form for all images in C<dir>
to an output text file named "out.txt".

=item exiftool -s -ImageSize -ExposureTime b.jpg

Print ImageSize and ExposureTime tag names and values.

=item exiftool -l -canon c.jpg d.jpg

Print standard Canon information from two image files.

=item exiftool -r -w .txt -common pictures

Recursively extract common meta information from files in C<pictures>
directory, writing text output into files with the same names but with a
C<.txt> extension.

=item exiftool -b -ThumbnailImage image.jpg > thumbnail.jpg

Save thumbnail image from C<image.jpg> to a file called C<thumbnail.jpg>.

=item exiftool -b -PreviewImage 118_1834.JPG > preview.jpg

Extract preview image from JPG file and write it to C<preview.jpg>.

=item exiftool -b -JpgFromRaw -w _JFR.JPG -ext CRW -r .

Recursively extract JPG image from all Canon CRW files in the current
directory, adding C<_JFR.JPG> for the name of the output JPG files.

=item exiftool -d '%r %a, %B %e, %Y' -DateTimeOriginal -S -s *.jpg

Print formatted date/time for all JPG files in a directory.

=item exiftool -IFD1:XResolution -IFD1:YResolution image.jpg

Extract image resolution from EXIF IFD1 information (thumbnail image IFD).

=item exiftool -xmp:author:all -a image.jpg

Extract all author-related XMP information from an image.

=item exiftool -xmp -b a.jpg > out.xmp

Extract complete XMP data record intact from C<a.jpg> and write it to
C<out.xmp> using the special C<XMP> tag (see the Extra tags in
L<Image::ExifTool::TagNames|Image::ExifTool::TagNames>).

=item exiftool -p '$filename has date $dateTimeOriginal' -q -f dir

Print one line of output containing the file name and DateTimeOriginal for
each image in directory C<dir>.

=item exiftool -ee -p '$gpslatitude, $gpslongitude, $gpstimestamp' a.m2ts

Extract all GPS positions from an AVCHD video.

=item exiftool -icc_profile -b -w icc image.jpg

Save complete ICC_Profile from an image to an output file with the same name
and an extension of C<.icc>.

=item exiftool -htmldump -w tmp/%f_%e.html t/images

Generate HTML pages from a hex dump of EXIF information in all images from
the C<t/images> directory.  The output HTML files are written to the C<tmp>
directory (which is created if it didn't exist), with names of the form
'FILENAME_EXT.html'.

=back

=head1 WRITING EXAMPLES

Note that quotes are necessary around arguments which contain certain
special characters such as C<E<gt>>, C<E<lt>> or any white space.  These
quoting techniques are shell dependent, but the examples below will work for
most Unix shells.  With the Windows cmd shell however, double quotes should
be used (ie. -Comment=E<34>This is a new commentE<34>).

=over 5

=item exiftool -Comment='This is a new comment' dst.jpg

Write new comment to a JPG image (replaces any existing comment).

=item exiftool -comment= -o newdir *.jpg

Remove comment from all JPG images in the current directory, writing the
modified images to a new directory.

=item exiftool -keywords=EXIF -keywords=editor dst.jpg

Replace existing keyword list with two new keywords (C<EXIF> and C<editor>).

=item exiftool -Keywords+=word -o newfile.jpg src.jpg

Copy a source image to a new file, and add a keyword (C<word>) to the
current list of keywords.

=item exiftool -credit-=xxx dir

Delete Credit information from all files in a directory where the Credit
value was (C<xxx>).

=item exiftool -xmp:description-de='k&uuml;hl' -E dst.jpg

Write alternate language for XMP:Description, using HTML character escaping
to input special characters.

=item exiftool -all= dst.jpg

Delete all meta information from an image.  Note: You should NOT do this to
RAW images (except DNG) since proprietary RAW image formats often contain
information in the makernotes that is necessary for converting the image.

=item exiftool -all= -comment='lonely' dst.jpg

Delete all meta information from an image and add a comment back in.  (Note
that the order is important: C<-comment='lonely' -all=> would also delete
the new comment.)

=item exiftool -all= --jfif:all dst.jpg

Delete all meta information except JFIF group from an image.

=item exiftool -Photoshop:All= dst.jpg

Delete Photoshop meta information from an image (note that the Photoshop
information also includes IPTC).

=item exiftool -r -XMP-crss:all= DIR

Recursively delete all XMP-crss information from images in a directory.

=item exiftool '-ThumbnailImageE<lt>=thumb.jpg' dst.jpg

Set the thumbnail image from specified file (Note: The quotes are neccessary
to prevent shell redirection).

=item exiftool '-JpgFromRawE<lt>=%d%f_JFR.JPG' -ext CRW -r .

Recursively write JPEG images with filenames ending in C<_JFR.JPG> to the
JpgFromRaw tag of like-named files with extension C<.CRW> in the current
directory.  (This is the inverse of the C<-JpgFromRaw> command of the
L</READING EXAMPLES> section above.)

=item exiftool -DateTimeOriginal-='0:0:0 1:30:0' dir

Adjust original date/time of all images in directory C<dir> by subtracting
one hour and 30 minutes.  (This is equivalent to C<-DateTimeOriginal-=1.5>.
See L<Image::ExifTool::Shift.pl|Image::ExifTool::Shift.pl> for details.)

=item exiftool -createdate+=3 -modifydate+=3 a.jpg b.jpg

Add 3 hours to the CreateDate and ModifyDate timestamps of two images.

=item exiftool -AllDates+=1:30 -if '$make eq E<34>CanonE<34>' dir

Shift the values of DateTimeOriginal, CreateDate and ModifyDate forward by 1
hour and 30 minutes for all Canon images in a directory.  (The AllDates tag
is provided as a shortcut for these three tags, allowing them to be accessed
via a single tag.)

=item exiftool -xmp:city=Kingston image1.jpg image2.nef

Write a tag to the XMP group of two images.  (Without the C<xmp:> this tag
would get written to the IPTC group since C<City> exists in both, and IPTC
is preferred by default.)

=item exiftool -LightSource-='Unknown (0)' dst.tiff

Delete C<LightSource> tag only if it is unknown with a value of 0.

=item exiftool -whitebalance-=auto -WhiteBalance=tung dst.jpg

Set C<WhiteBalance> to C<Tungsten> only if it was previously C<Auto>.

=item exiftool -comment-= -comment='new comment' a.jpg

Write a new comment only if the image doesn't have one already.

=item exiftool -o %d%f.xmp dir

Create XMP meta information data files for all images in C<dir>.

=item exiftool -o test.xmp -owner=Phil -title='XMP File'

Create an XMP data file only from tags defined on the command line.

=item exiftool '-ICC_Profile<=%d%f.icc' image.jpg

Write ICC_Profile to an image from a C<.icc> file of the same name.

=item exiftool -trailer:all= image.jpg

Delete any trailer found after the end of image (EOI) in a JPEG file.  A
number of digital cameras store a large PreviewImage after the JPEG EOI, and
the file size may be reduced significantly by deleting this trailer.  See
the L<JPEG Tags documentation|Image::ExifTool::TagNames/JPEG Tags> for a
list of recognized JPEG trailers.

=back

=head1 COPYING EXAMPLES

These examples demonstrate the ability to copy tag values between files.

=over 5

=item exiftool -tagsFromFile src.crw dst.jpg

Copy the values of all writable tags from C<src.crw> to C<dst.jpg>, writing
the information to the preferred groups.

=item exiftool -TagsFromFile src.jpg -all:all dst.jpg

Copy the values of all writable tags from C<src.jpg> to C<dst.jpg>,
preserving the original tag groups.

=item exiftool -all= -tagsfromfile src.jpg -exif:all dst.jpg

Erase all meta information from C<dst.jpg> image, then copy EXIF tags from
C<src.jpg>.

=item exiftool -exif:all= -tagsfromfile @ -all:all -unsafe bad.jpg

Rebuild all EXIF meta information from scratch in an image.  This technique
can be used in JPEG images to repair corrupted EXIF information which
otherwise could not be written due to errors. The C<Unsafe> tag is a
shortcut for unsafe EXIF tags in JPEG images which are not normally copied. 
See the L<tag name documentation|Image::ExifTool::TagNames> for more details
about unsafe tags.

=item exiftool -Tagsfromfile a.jpg out.xmp

Copy meta information from C<a.jpg> to an XMP data file.  If the XMP data
file C<out.xmp> already exists, it will be updated with the new information.
Otherwise the XMP data file will be created.  Only XMP, ICC and MIE files
may be created like this (other file types may be edited but not created).
See L</WRITING EXAMPLES> above for another technique to generate XMP files.

=item exiftool -tagsFromFile a.jpg -XMP:All= -ThumbnailImage= -m b.jpg

Copy all meta information from C<a.jpg> to C<b.jpg>, deleting all XMP
information and the thumbnail image from the destination.

=item exiftool -TagsFromFile src.jpg -title -author=Phil dst.jpg

Copy title from one image to another and set a new author name.

=item exiftool -TagsFromFile a.jpg -ISO -TagsFromFile b.jpg -comment
dst.jpg

Copy ISO from one image and Comment from another image to a destination
image.

=item exiftool -tagsfromfile src.jpg -exif:all --subifd:all dst.jpg

Copy only the EXIF information from one image to another, excluding SubIFD
tags.

=item exiftool '-DateTimeOriginal>FileModifyDate' dir

Use the original date from the meta information to set the same file's
filesystem modification date for all images in a directory.  (Note that
C<-TagsFromFile @> is assumed if no other B<-TagsFromFile> is specified when
redirecting information as in this example.)

=item exiftool -TagsFromFile src.jpg '-all>xmp:all' dst.jpg

Copy all possible information from C<src.jpg> and write in XMP format to
C<dst.jpg>.

=item exiftool -@ iptc2xmp.args -iptc:all= a.jpg

Translate IPTC information to XMP with appropriate tag name conversions, and
delete the original IPTC information from an image.  This example uses
iptc2xmp.args, which is a file included with the ExifTool distribution that
contains the required arguments to convert IPTC information to XMP format.
Also included with the distribution is xmp2iptc.args, which performs the
inverse conversion.

=item exiftool -tagsfromfile %d%f.CRW -r -ext JPG dir

Recursively rewrite all C<JPG> images in C<dir> with information copied from
the corresponding C<CRW> images in the same directories.

=item exiftool '-make+>keywords' image.jpg

Add camera make to list of keywords.

=item exiftool '-comment<ISO=$exif:iso Exposure=${shutterspeed}' dir

Set the Comment tag of all images in C<dir> from the values of the EXIF:ISO
and ShutterSpeed tags.  The resulting comment will be in the form "ISO=100
Exposure=1/60".

=item exiftool -TagsFromFile src.jpg -icc_profile dst.jpg

Copy ICC_Profile from one image to another.

=item exiftool -TagsFromFile src.jpg -all:all dst.mie

Copy all meta information in its original form from a JPEG image to a MIE
file.  The MIE file will be created if it doesn't exist.  This technique can
be used to store the metadata of an image so it can be inserted back into
the image (with the inverse command) later in a workflow.

=item exiftool -o dst.mie -all:all src.jpg

This command performs exactly the same task as the command above, except
that the C<-o> option will not write to an output file that already exists.

=item exiftool -if '$jpgfromraw' -b -jpgfromraw -w %d%f_%ue.jpg -execute
-if '$previewimage' -b -previewimage -w %d%f_%ue.jpg -execute
-tagsfromfile @ -srcfile %d%f_%ue.jpg -overwrite_original
-common_args --ext jpg DIR

[Advanced] Extract JpgFromRaw or PreviewImage from all but JPG files in DIR,
saving them with file names like C<image_EXT.jpg>, then add all meta
information from the original files to the extracted images.  Here, the
command line is broken into three sections (separated by B<-execute>
options), and each is executed as if it were a separate command.  The
B<-common_args> option causes the C<--ext jpg DIR> arguments to be applied
to all three commands, and the B<-srcfile> option allows the extracted JPG
image to be the source file for the third command (whereas the RAW files are
the source files for the other two commands).

=back

=head1 RENAMING EXAMPLES

By writing the C<FileName> and C<Directory> tags, files are renamed and/or
moved to new directories.  This can be particularly useful and powerful for
organizing files by date when combined with the B<-d> option.  New
directories are created as necessary, but existing files will not be
overwritten.  The format codes %d, %f and %e may be used in the new file
name to represent the directory, name and extension of the original file,
and %c may be used to add a copy number if the file already exists (see the
B<-w> option for details).  Note that if used within a date format string,
an extra '%' must be added to pass these codes through the date/time parser.
(And further note that in a Windows batch file, all '%' characters must also
be escaped, so in this extreme case '%%%%f' is necessary to pass a simple
'%f' through the two levels of parsing.)  See
L<http://owl.phy.queensu.ca/~phil/exiftool/filename.html> for additional
documentation and examples.

=over 5

=item exiftool -filename=new.jpg dir/old.jpg

Rename C<old.jpg> to C<new.jpg> in directory C<dir>.

=item exiftool -directory=%e dir

Move all files from directory C<dir> into directories named by the original
file extensions.

=item exiftool '-Directory<DateTimeOriginal' -d %Y/%m/%d dir

Move all files in C<dir> into a directory hierarchy based on year, month and
day of C<DateTimeOriginal>.  ie) This command would move the file
C<dir/image.jpg> with a C<DateTimeOriginal> of C<2005:10:12 16:05:56> to
C<2005/10/12/image.jpg>.

=item exiftool -o . '-Directory<DateTimeOriginal' -d %Y/%m/%d dir

Same effect as above except files are copied instead of moved.

=item exiftool '-filename<%f_${focallength}.%e' dir

Rename all files in C<dir> by adding FocalLength to the file name.

=item exiftool '-FileName<CreateDate' -d %Y%m%d_%H%M%S%%-c.%%e dir

Rename all images in C<dir> according to the C<CreateDate> date and time,
adding a copy number with leading '-' if the file already exists (C<%-c>),
and preserving the original file extension (C<%e>).  Note the extra '%'
necessary to escape the filename codes (C<%c> and C<%e>) in the date format
string.

=item exiftool -r '-FileName<CreateDate' -d %Y-%m-%d/%H%M_%%f.%%e dir

Both the directory and the filename may be changed together via the
C<FileName> tag if the new C<FileName> contains a '/'.  The example above
recursively renames all images in a directory by adding a C<CreateDate>
timestamp to the start of the filename, then moves them into new directories
named by date.

=item exiftool '-FileName<${CreateDate}_$filenumber.jpg' -d %Y%m%d *.jpg

Set the filename of all JPG images in the current directory from the
CreateDate and FileNumber tags, in the form "20060507_118-1861.jpg".

=back

=head1 GEOTAGGING EXAMPLES

ExifTool implements geotagging via 3 special tags: Geotag (which for
convenience is also implemented as an exiftool option), Geosync and Geotime.
The examples below highlight some geotagging features.  See
L<http://owl.phy.queensu.ca/~phil/exiftool/geotag.html> for additional
documentation.

=over 5

=item exiftool -geotag track.log a.jpg

Geotag an image (C<a.jpg>) from position information in a GPS track log
(C<track.log>).  Since the C<Geotime> tag is not specified, the value of
DateTimeOriginal is used for geotagging.  Local system time is assumed
unless DateTimeOriginal contains a timezone.

=item exiftool -geotag t.log -geotime='2009:04:02 13:41:12-05:00' a.jpg

Geotag an image with the GPS position for a specific time.  (Note that the
C<Geotag> tag must be assigned before C<Geotime> for the GPS data to be
available when C<Geotime> is set.)

=item exiftool -geotag log.gpx '-xmp:geotimeE<lt>createdate' dir

Geotag all images in directory C<dir> with XMP tags instead of EXIF tags,
based on the image CreateDate.  (In this case, the order of the arguments
doesn't matter because tags with values copied from other tags are always
set after constant values.)

=item exiftool -geotag a.log -geosync=-20 dir

Geotag images in directory C<dir>, accounting for image timestamps which
were 20 seconds ahead of GPS.

=item exiftool -geotag a.log -geosync=1.jpg -geosync=2.jpg dir

Geotag images using time synchronization from two previously geotagged images
(1.jpg and 2.jpg), synchronizing the image and GPS times using a linear time
drift correction.

=item exiftool -geotag a.log '-geotimeE<lt>${createdate}+01:00' dir

Geotag images in C<dir> using CreateDate with the specified timezone.  If
CreateDate already contained a timezone, then the timezone specified on the
command line is ignored.

=item exiftool -geotag= a.jpg

Delete GPS tags which may have been added by the geotag feature.  Note that
this does not remove all GPS tags -- to do this instead use C<-gps:all=>.

=item exiftool -xmp:geotag= a.jpg

Delete XMP GPS tags which were added by the geotag feature.

=item exiftool -xmp:geotag=track.log a.jpg

Geotag an image with XMP tags, using the time from DateTimeOriginal.

=item exiftool -geotag a.log -geotag b.log -r dir

Combine multiple track logs and geotag an entire directory tree of images.

=item exiftool -geotag 'tracks/*.log' -r dir

Read all track logs from the C<tracks> directory.

=item exiftool -p gpx.fmt -d %Y-%m-%dT%H:%M:%SZ dir > out.gpx

Generate a GPX track log from all images in directory C<dir>.  This example
uses the C<gpx.fmt> file included in the full ExifTool distribution package
and assumes that the images in C<dir> have all been previously geotagged.

=back

=head1 PIPING EXAMPLES

=over 5

=item cat a.jpg | exiftool -

Extract information from stdin.

=item exiftool image.jpg -thumbnailimage -b | exiftool -

Extract information from an embedded thumbnail image.

=item cat a.jpg | exiftool -iptc:keywords+=fantastic - > b.jpg

Add an IPTC keyword in a pipeline, saving output to a new file.

=item wget -qO - http://a.domain.com/bigfile.jpg | exiftool -fast -

Extract information from an image over the internet using the GNU wget
utility.  The B<-fast> option prevents exiftool from scanning for trailer
information, so only the meta information header is transferred.

=item exiftool a.jpg -thumbnailimage -b | exiftool -comment=wow - |
exiftool a.jpg -thumbnailimage'<=-'

Add a comment to an embedded thumbnail image.  (Why anyone would want to do
this I don't know, but I've included this as an example to illustrate the
flexibility of ExifTool.)

=back

=head1 DIAGNOSTICS

The exiftool application exits with a status of 0 on success, or 1 if an
error occured or if all files failed the B<-if> condition.

=head1 BUGS

ExifTool does not handle information stored in the resource fork on
Macintosh filesystems.

=head1 AUTHOR

Copyright 2003-2010, Phil Harvey

This is free software; you can redistribute it and/or modify it under the
same terms as Perl itself.

=head1 SEE ALSO

L<Image::ExifTool(3pm)|Image::ExifTool>,
L<Image::ExifTool::TagNames(3pm)|Image::ExifTool::TagNames>,
L<Image::ExifTool::Shortcuts(3pm)|Image::ExifTool::Shortcuts>,
L<Image::ExifTool::Shift.pl|Image::ExifTool::Shift.pl>

=cut

#------------------------------------------------------------------------------
# end
