linux man page for groups

GROUPS(1)							   User Commands							 GROUPS(1)

NAME
       groups - print the groups a user is in

SYNOPSIS
       groups [OPTION]... [USERNAME]...

DESCRIPTION
       Print group memberships for each USERNAME or, if no USERNAME is specified, for the current process (which may differ if the groups database
       has changed).

       --help display this help and exit

       --version
	      output version information and exit

AUTHOR
       Written by David MacKenzie and James Youngman.

REPORTING BUGS
       Report groups 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 groups 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 groups is maintained as a Texinfo manual.  If the info and groups programs are properly installed at your  site,
       the command

	      info coreutils 'groups invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011							 GROUPS(1)