       id options
              This  command  provides a means of getting, setting
              and converting user, group and process ids.  The id
              command has the following options:

            id user ?name?

            id userid ?uid?
                   Set  the real and effective user ID to name or
                   uid, if the name (or uid) is valid and permis-
                   sions  allow  it.  If the name (or uid) is not
                   specified,  the  current  name  (or  uid)   is
                   returned.

            id convert userid uid

            id convert user name
                   Convert  a  user  ID number to a user name, or
                   vice versa.

            id group ?name?

            id groupid ?gid?
                   Set the real and effective group ID to name or
                   gid, if the name (or gid) is valid and permis-
                   sions allow it.  If the group name (or gid) is
                   not specified, the current group name (or gid)
                   is returned.

            id groups

            id groupids
                   Return the current group access  list  of  the
                   process.   The  option  groups  returns  group
                   names and groupids returns id numbers.

            id convert groupid gid

            id convert group name
                   Convert a group ID number to a group name,  or
                   vice versa.

            id effective user

            id effective userid
                   Return  the  effective user name, or effective
                   user ID number, respectively.

            id effective group

            id effective groupid
                   Return the effective group name, or  effective
                   group ID number, respectively.
            id effective groupids
                   Return  all of the groupids the user is a mem-
                   ber of.

            id host
                   Return the hostname of the system the  program
                   is running on.

            id process
                   Return  the process ID of the current process.

            id process parent
                   Return the process ID of  the  parent  of  the
                   current process.

            id process group
                   Return  the  process  group  ID of the current
                   process.

            id process group set
                   Set the process group ID of the  current  pro-
                   cess to its process ID.

            id host
                   Returns  the standard host name of the machine
                   the process is executing on.

       This command is provided by Extended Tcl.
