#!/bin/sh
# nohup -- run a command immume to hangups, with output to a non-tty
# Copyright (C) 1991 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

# Written by David MacKenzie <djm@gnu.ai.mit.edu>.

# Make sure we get GNU nice, if possible; also allow
# it to be somewhere else in PATH if not installed yet.
PATH=/usr/bin:$PATH

usage="Usage: $0 COMMAND [ARG]...
  or:  $0 OPTION"

usage_try="
Try \`$0 --help' for more information."

usage_help="
  --help      display this help and exit
  --version   output version information and exit"

if [ $# -eq 0 ]; then
  echo >&2 "$usage"
  echo >&2 "$usage_try"
  exit 1
fi

case $# in
  1 )
    case "z${1}" in 
      z--help )
	 echo "$usage"; echo "$usage_help"; exit 0 ;;
      z--version )
	 echo "GNU shellutils 1.9.4"; exit 0 ;;
      * ) ;;
    esac
    ;;
  * ) ;;
esac

trap "" 1
oldmask=`umask`; umask 077
# Only redirect the output if the user didn't already do it.
if [ -t 1 ]; then
  # If we cannot write to the current directory, use the home directory.
  if cat /dev/null >> nohup.out; then
    echo "nohup: appending output to \`nohup.out'" 2>&1
    umask $oldmask
    exec nice -5 "$@" >> nohup.out 2>&1
  else
    cat /dev/null >> $HOME/nohup.out
    echo "nohup: appending output to \`$HOME/nohup.out'" 2>&1
    umask $oldmask
    exec nice -5 "$@" >> $HOME/nohup.out 2>&1
  fi
else
  umask $oldmask
  exec nice -5 "$@"
fi