topic Run the process in Operating System - HP-UX

Run the process

hanyyu1 — Wed, 14 Dec 2005 00:39:18 GMT

In my server , there is a process need to keep on running , this processs may take 5-10 mins to run ( depends the situation ) , if I add a cron to run this job in every 5 mins ( eg. */5 ) , there will be two duplicate process in the system , if add a cron to run in every 10 mins , then there may be no job is running for 5 mins , is it possible to make sure the job is running but don't have a duplicate job ? thx

Re: Run the process

RAC_1 — Wed, 14 Dec 2005 00:50:55 GMT

Why not?? Run job through cron every 10 minutes. The script first should check if another instance of job is running or not. If running, it will not run another instance and if not running it will start one.

Following code will do that.

job_status=$(UNIX95= ps -C"process_name"|wc -l)

if [[ ${job_status} -gt 0 ]]
then
"start_your_job"
else
exit #not starting the job
fi

Re: Run the process

Muthukumar_5 — Wed, 14 Dec 2005 01:44:12 GMT

You can leave cron idea here.

Start a process and check for process completion with it's PID using ps command. Start again once it is completed.

./process &
pid=$!;

check with this $pid variable using while loop.

-Muthu

Re: Run the process

Yogeeraj_1 — Wed, 14 Dec 2005 01:50:35 GMT

hi,

there is also the possibility to use the script itself to reschedule itself using the "at" command. See man at

e.g.

echo "$util/yourscript.sh"|at `<

 /dev/null

so that it gives something like:
echo "$util/yourscript.sh"|at 8:00am > /dev/null

hope this helps too!

kind regards
yogeeraj

Re: Run the process

Hemmetter — Wed, 14 Dec 2005 03:04:25 GMT

Hi hanyyu1

What about an inittab(4) entry for this?

Then init(1) will observe that process and respawn a new one when the old one termiates.

rgds
HGH