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CentOS 7.0 - man page for groups (centos section 1)

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 GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report groups translation bugs to <http://translationproject.org/team/>
AUTHOR
Written by David MacKenzie and James Youngman.
COPYRIGHT
Copyright (C) 2013 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 8.22 June 2014 GROUPS(1)