Run the process

[hanyyu1]

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

[RAC_1]

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

[Muthukumar_5]

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

[Yogeeraj_1]

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

[Hemmetter]

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