[PATCH] implement groups applet

[Tanguy Pruvot]

This applet is used by WinSCP on SCP login to know user groups
Code only implements the "groups" standalone syntax


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 at 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 © 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                                                     April 2010                                                            GROUPS(1)
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