src/groups.sh

   1 #!/bin/sh
   2 # groups -- print the groups a user is in
   3 # Copyright (C) 1991, 1997, 2000, 2002, 2004, 2006 Free Software Foundation, Inc.
   4
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2, or (at your option)
   8 # any later version.
   9
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program; if not, write to the Free Software Foundation,
  17 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18
  19 # Written by David MacKenzie <djm@gnu.ai.mit.edu>.
  20
  21 # Make sure we get GNU id, if possible; also allow
  22 # it to be somewhere else in PATH if not installed yet.
  23 PATH=@bindir@:$PATH
  24
  25 usage="Usage: $0 [OPTION]... [USERNAME]...
  26
  27   --help      display this help and exit
  28   --version   output version information and exit
  29
  30 Same as id -Gn.  If no USERNAME, use current process.
  31
  32 Report bugs to <@PACKAGE_BUGREPORT@>."
  33
  34 version='groups (@GNU_PACKAGE@) @VERSION@
  35 Written by David MacKenzie.
  36
  37 Copyright (C) 2006 Free Software Foundation, Inc.
  38 This is free software; see the source for copying conditions.  There is NO
  39 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.'
  40
  41
  42 for arg
  43 do
  44   case $arg in
  45     --help | --hel | --he | --h)
  46       exec echo "$usage" ;;
  47     --version | --versio | --versi | --vers | --ver | --ve | --v)
  48       exec echo "$version" ;;
  49     --)
  50       shift
  51       break ;;
  52     -*)
  53       echo "$0: invalid option: $arg" >&2
  54       exit 1 ;;
  55   esac
  56 done
  57
  58 # With fewer than two arguments, simply exec "id".
  59 case $# in
  60   0|1) exec id -Gn -- "$@" ;;
  61 esac
  62
  63 # With more, we need a loop, and be sure to exit nonzero upon failure.
  64 status=0
  65 write_error=0
  66
  67 for name
  68 do
  69   if groups=`id -Gn -- "$name"`; then
  70     echo "$name : $groups" || {
  71       status=$?
  72       if test $write_error = 0; then
  73         echo "$0: write error" >&2
  74         write_error=1
  75       fi
  76     }
  77   else
  78     status=$?
  79   fi
  80 done
  81
  82 exit $status