linux man page for id

ID(1)								   User Commands							     ID(1)

NAME
       id - print real and effective user and group IDs

SYNOPSIS
       id [OPTION]... [USERNAME]

DESCRIPTION
       Print user and group information for the specified USERNAME, or (when USERNAME omitted) for the current user.

       -a     ignore, for compatibility with other versions

       -Z, --context
	      print only the security context of the current user

       -g, --group
	      print only the effective group ID

       -G, --groups
	      print all group IDs

       -n, --name
	      print a name instead of a number, for -ugG

       -r, --real
	      print the real ID instead of the effective ID, with -ugG

       -u, --user
	      print only the effective user ID

       --help display this help and exit

       --version
	      output version information and exit

       Without any OPTION, print some useful set of identified information.

AUTHOR
       Written by Arnold Robbins and David MacKenzie.

REPORTING BUGS
       Report id bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report id translation bugs to <http://translationproject.org/team/>

COPYRIGHT
       Copyright (C) 2010 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       The full documentation for id is maintained as a Texinfo manual.  If the info and id programs are properly installed at your site, the com-
       mand

	      info coreutils 'id invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011							     ID(1)