id; man page

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SYNOPSIS
       id [OPTION]... [USERNAME]

DESCRIPTION
       Print information for USERNAME, or the current user.

       -a     ignore, for compatibility with other versions

       -Z, --context
              print only the security context

       -g, --group
              print only the effective group ID

       -G, --groups
              print all group IDs

       -n, --name
              print a name instead of a number, for -ugG

       -r, --real
              print the real ID instead of the effective ID, with -ugG

       -u, --user
              print only the effective user ID

       --help display this help and exit

       --version
              output version information and exit

       Without any OPTION, print some useful set of identified information.

AUTHOR
       Written by Arnold Robbins and David MacKenzie.

REPORTING BUGS
       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT
       Copyright © 2006 Free Software Foundation, Inc.
       This  is  free  software.   You may redistribute copies of it under the
       terms      of      the      GNU      General       Public       License
       <http://www.gnu.org/licenses/gpl.html>.   There  is NO WARRANTY, to the
       extent permitted by law.

SEE ALSO
       The full documentation for id is maintained as a  Texinfo  manual.   If
       the  info and id programs are properly installed at your site, the com‐
       mand

              info id
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