src/nohup.sh

   1 #!/bin/sh
   2 # nohup -- run a command immume to hangups, with output to a non-tty
   3 # Copyright (C) 1991, 1997, 1999, 2000, 2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 # Written by David MacKenzie <djm@gnu.ai.mit.edu>.
  20
  21 usage="Usage: $0 COMMAND [ARG]...
  22   or:  $0 OPTION"
  23
  24 usage_try="
  25 Try \`$0 --help' for more information."
  26
  27 usage_help="Run COMMAND, ignoring hangup signals.
  28
  29   --help      display this help and exit
  30   --version   output version information and exit
  31
  32 Report bugs to <@PACKAGE_BUGREPORT@>."
  33
  34 if [ $# -eq 0 ]; then
  35   echo >&2 "$usage"
  36   echo >&2 "$usage_try"
  37   exit 127
  38 fi
  39
  40 fail=0
  41 case $# in
  42   1 )
  43     case "z${1}" in
  44       z--help )
  45          echo "$usage" || fail=127; echo "$usage_help" || fail=127
  46          exit $fail;;
  47       z--version )
  48          echo "nohup (@GNU_PACKAGE@) @VERSION@" || fail=127
  49          exit $fail;;
  50       * ) ;;
  51     esac
  52     ;;
  53   * ) ;;
  54 esac
  55
  56 trap "" 1
  57
  58 # Redirect stdout if the user didn't already do it.
  59 if [ -t 1 ]; then
  60   oldmask=`umask`; umask 077
  61   # If we cannot write to the current directory, use the home directory.
  62   if exec >> nohup.out; then
  63     echo "nohup: appending output to \`nohup.out'" >&2
  64   elif exec >> "$HOME/nohup.out"; then
  65     echo "nohup: appending output to \`$HOME/nohup.out'" >&2
  66   else
  67     echo "nohup: cannot append to either \`nohup.out' or \`$HOME/nohup.out'" \
  68       >&2
  69     exit 127
  70   fi
  71   umask $oldmask
  72 fi
  73
  74 # Redirect stderr if the user didn't already do it.
  75 if [ -t 2 ]; then
  76   exec 2>&1
  77 fi
  78
  79 exec "$@"