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[coreutils.git] / src / nohup.sh
bloba7526c4b30cd91fcb02265e5ecabc73931b5b708
1 #!/bin/sh
2 # nohup -- run a command immume to hangups, with output to a non-tty
3 # Copyright (C) 1991, 1997, 1999 Free Software Foundation, Inc.
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.
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.
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. */
19 # Written by David MacKenzie <djm@gnu.ai.mit.edu>.
21 usage="Usage: $0 COMMAND [ARG]...
22 or: $0 OPTION"
24 usage_try="
25 Try \`$0 --help' for more information."
27 usage_help="Run COMMAND, ignoring hangup signals.
29 --help display this help and exit
30 --version output version information and exit
32 Report bugs to <sh-utils-bugs@gnu.org>."
34 if [ $# -eq 0 ]; then
35 echo >&2 "$usage"
36 echo >&2 "$usage_try"
37 exit 1
40 case $# in
41 1 )
42 case "z${1}" in
43 z--help )
44 echo "$usage"; echo "$usage_help"; exit 0 ;;
45 z--version )
46 echo "nohup (@GNU_PACKAGE@) @VERSION@"; exit 0 ;;
47 * ) ;;
48 esac
50 * ) ;;
51 esac
53 # Make sure we get GNU nice, if possible; also allow
54 # it to be somewhere else in PATH if not installed yet.
55 # But do not modify PATH itself.
56 IFS="${IFS= }"; save_ifs="$IFS"; IFS=":"
57 nicepath="@bindir@:$PATH"
58 niceprog="nice"
59 for nicedir in $nicepath; do
60 test -z "$nicedir" && nicedir="."
61 if test -x "$nicedir/nice"; then
62 niceprog="$nicedir/nice"
63 break
65 done
66 IFS="$save_ifs"
68 trap "" 1
69 oldmask=`umask`; umask 077
70 # Only redirect the output if the user didn't already do it.
71 if [ -t 1 ]; then
72 # If we cannot write to the current directory, use the home directory.
73 if cat /dev/null >> nohup.out; then
74 echo "nohup: appending output to \`nohup.out'" 2>&1
75 umask $oldmask
76 exec "$niceprog" -5 -- "$@" >> nohup.out 2>&1
77 else
78 cat /dev/null >> $HOME/nohup.out
79 echo "nohup: appending output to \`$HOME/nohup.out'" 2>&1
80 umask $oldmask
81 exec "$niceprog" -5 -- "$@" >> $HOME/nohup.out 2>&1
83 else
84 umask $oldmask
85 exec "$niceprog" -5 -- "$@"