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I am looking for very simple bash script that would allow me to launch a process a few times. What's essential to me is that after the processes terminate, everything will clean up automatically.

Intended usage:

bash multiplerun.sh 5 executable.sh parameters_to_executable

I could probably write it myself, but it would take me so long that I've decided to ask experts; I'm very little skilled at using *ix systems.

EDIT: Oh, and I forgot to add that I want to run them in parallel - running them one after another is pretty straightforward.

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  • Isn't there some tension between "quick and dirty" and "everything cleaned up automatically"? The task is pretty difficult if the processes work on files, btw... Commented May 19, 2012 at 16:23
  • They don't work on files - they're only used as dummy clients connecting to a server. Commented May 19, 2012 at 19:34

2 Answers 2

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Here is something that will launch your programs in parallel:

#!/bin/bash count=$1 command=$2 shift 2 for ((i=0;i<count;i++)); do $command "$@" & done wait echo done

The wait instruction should prevent zombies to show up. If your programs do not need a tty, you can replace the loop with:

for ((i=0;i<count;i++)); do nohup $command "$@" </dev/null >/dev/null 2>&1 & done

That way, the processes will be detached from your shell.

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  • As for the cleanup - I meant that there won't be any zombie processes, screens or anything running. I'm gonna run the script more than once and I didn't want to end up with 1000 zombies just sitting there. Commented May 19, 2012 at 19:35
  • Answer updated. Commented May 19, 2012 at 20:15
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If you have GNU Parallel http://www.gnu.org/software/parallel/ installed you can do this:

seq 5 | parallel -N0 executable.sh parameters_to_executable

You can install GNU Parallel simply by:

wget http://git.savannah.gnu.org/cgit/parallel.git/plain/src/parallel chmod 755 parallel cp parallel sem

Watch the intro videos for GNU Parallel to learn more: https://www.youtube.com/playlist?list=PL284C9FF2488BC6D1

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