groups --version (return code: 0)
groups (GNU coreutils) 8.25 Copyright (C) 2016 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. Written by David MacKenzie and James Youngman.
groups --help (return code: 0)
Usage: 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 GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Full documentation at: <http://www.gnu.org/software/coreutils/groups> or available locally via: info '(coreutils) groups invocation'