Date: Fri, 5 Jun 2009 18:48:28 -0400 (EDT) From: vogelke+unix@pobox.com (Karl Vogel) To: freebsd-questions@freebsd.org Subject: Re: Can a Bourn Shell Script put itself in the background? Message-ID: <20090605224828.18F65BED2@kev.msw.wpafb.af.mil> In-Reply-To: <20090605190200.GH87456@kokopelli.hydra> (message from Chad Perrin on Fri, 5 Jun 2009 13:02:00 -0600)
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>> On Fri, 5 Jun 2009 13:02:00 -0600,
>> Chad Perrin <perrin@apotheon.com> said:
C> I got the impression this question was about a script backgrounding itself,
C> though -- possibly creating a daemon using bash.
Same here. This seems a bit slimy, but it works (assuming you don't
already have an environment variable called DAEMON):
me% cat doit
#!/bin/ksh
# script to daemonize itself.
PATH=/usr/local/bin:/bin:/usr/bin:/usr/sbin; export PATH
umask 022
env | grep 'DAEMON=yes' > /dev/null
case $? in
0) logger -t test "$$ is a daemon, args $@"
;;
1) echo "$$ not a daemon, args $@"
DAEMON=yes daemon $0 ${1+"$@"}
;;
esac
exit 0
me% ./doit a b c
18131 not a daemon, args a b c
me% tail -1 /var/log/syslog
Jun 5 18:41:54 host test: 18135 is a daemon, args a b c
--
Karl Vogel I don't speak for the USAF or my company
Gingko Viagra: to help you remember what the f*** you're doing.
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