topic run shell scripts sequentially. in Operating System - Linux

run shell scripts sequentially.

Rohit Khaladkar — Fri, 19 Sep 2008 05:14:44 GMT

Hi All,
I have a master script , which would run 4 scripts in sequence. When the first script gets executed , I need to check if a particular process has been completed. If it is completed , only then proceed with the second script.

This same rule applies to script3 and script4.

Can someone please help me out.This is the function that I wrote for the process check.

process_check ()
{
p1=`ps -ef | grep o1 |grep -v grep| wc -l`
if [ "$p1" = 0]
echo "Process not running"
return 0
else
echo "Process completed"
return 1
}

Re: run shell scripts sequentially.

Ralph Grothe — Fri, 19 Sep 2008 10:33:25 GMT

As this is posted in the Linux section
why not use pgrep like

$ proc_is_up() { pgrep ${1:-''} >/dev/null 2>&1; }

and simply base your control flow on it like

$ if proc_is_up bla;then echo runs;else echo absent;fi
absent

$ if proc_is_up httpd;then echo runs;else echo absent;fi
runs

Re: run shell scripts sequentially.

Fredrik.eriksson — Thu, 02 Oct 2008 12:46:06 GMT

Maybe pidof could work?
something like this:

if pidof name_of_proc; then
return 0
else
return 1
fi

If there are multiple process with the same name this probably won't work. It'll return the all the pids of all the process by that name. But if this is a unique name I would say that it's a good slim variant :)

Re: run shell scripts sequentially.

Ivan Ferreira — Thu, 02 Oct 2008 13:20:32 GMT

>>> I have a master script , which would run 4 scripts in sequence. When the first script gets executed , I need to check if a particular process has been completed. If it is completed , only then proceed with the second script.

I would then add the checking on the first script. If the process is running, exit with 0, if not, exit with 1.

Then in your master script set:

script1.sh && script2.sh

And so on.