Print the groups a user is in
groups [OPTION]... [USERNAME]...
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
Written by David MacKenzie and James Youngman.
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report groups translation bugs to <http://translationproject.org/team/>
Copyright © 2014 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.
Full documentation at: <http://www.gnu.org/software/coreutils/groups>
or available locally via: info '(coreutils) groups invocation'