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 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 # Make sure we get GNU nice, 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 COMMAND [ARG]...
  26   or:  $0 OPTION"
  27
  28 usage_try="
  29 Try \`$0 --help' for more information."
  30
  31 usage_help="Run COMMAND, ignoring hangup signals.
  32
  33   --help      display this help and exit
  34   --version   output version information and exit
  35
  36 Report bugs to <sh-utils-bugs@gnu.org>."
  37
  38 if [ $# -eq 0 ]; then
  39   echo >&2 "$usage"
  40   echo >&2 "$usage_try"
  41   exit 1
  42 fi
  43
  44 case $# in
  45   1 )
  46     case "z${1}" in
  47       z--help )
  48          echo "$usage"; echo "$usage_help"; exit 0 ;;
  49       z--version )
  50          echo "nohup (@GNU_PACKAGE@) @VERSION@"; exit 0 ;;
  51       * ) ;;
  52     esac
  53     ;;
  54   * ) ;;
  55 esac
  56
  57 trap "" 1
  58 oldmask=`umask`; umask 077
  59 # Only redirect the output if the user didn't already do it.
  60 if [ -t 1 ]; then
  61   # If we cannot write to the current directory, use the home directory.
  62   if cat /dev/null >> nohup.out; then
  63     echo "nohup: appending output to \`nohup.out'" 2>&1
  64     umask $oldmask
  65     exec nice -5 -- "$@" >> nohup.out 2>&1
  66   else
  67     cat /dev/null >> $HOME/nohup.out
  68     echo "nohup: appending output to \`$HOME/nohup.out'" 2>&1
  69     umask $oldmask
  70     exec nice -5 -- "$@" >> $HOME/nohup.out 2>&1
  71   fi
  72 else
  73   umask $oldmask
  74   exec nice -5 -- "$@"
  75 fi