# Standard System Access Reference

exit none Integer

The `exit` function terminates the executing program with the exit code specified as the argument.

sleep none Integer

The `sleep` function pause the specific thread for a certain time. The time argument is expressed in milliseconds. This function returns nil.

get-option String Character

The `get-option` function returns a formatted string equivalent to the system option as specified by the character argument.

get-unique-id Integer none

The `get-unique-id` function returns an unique integer number. The returned number is unique across the session.

get-pid Integer none

The `get-pid` function returns the process identifier (pid). The returned value is a positive integer.

get-env String String

The `get-env` function returns the environment variable associated with the string argument. If the environment does not exist an exception is raised.

get-host-fqdn String none

The `get-host-fqdn` function returns the host fully qualified domain name. This is the combined host and domain names which is sometimes called the canonical name.

get-domain-name String none

The `get-domain-name` function returns the host domain name.

get-host-name String none

The `get-host-name` function returns the host name. If the host does not have a domain name, the host name is equal to the fully qualified domain name.

get-user-name String none

The `get-user-name` function returns the current user name.