Re: how start a detached process in bash?

2006-03-03, 06:34(+11), Grant:
Hi there,

When I run 'script &' on command line I get the pid message and
the prompt back. This doesn't happen when I run 'script &' inside
a bash script, instead I get a command prompt but the bash as well
its 'script' are both running.

man bash doesn't have the word detach, so how do I start a detached
process (script &) from within a script?
[...]

If you want to detach it from bash, simply use disown:

disown %1

will detach the job number 1 (assuming you started it in
background).

Or start it as:

(cmd ...&)


If you want do detach it from the terminal (not make it a
login session bound process), either run it through at(1):

at now << EOF
cmd ...
EOF

or use start-stop-daemon if available on your system.

or use setsid(1) if available on your system:

setsid sh -c 'cd / && cmd ... & :' > /dev/null 2>&1 < /dev/null

--
Stéphane
.