Greeetings,

i am running monitoring script with the help of cron.

i need to stop the cron at friday some time for the backup

purpose . How to schedule in cron.

well naturally a cron entry is trivial enough to write...

0 20 * * 5 /path/to/script

but what your script needs to do is something we can't comment on as you've not gone into it in any depth at all.

I'm not understanding your question.

Stopping cron on friday will run a script...

How can cron run a script if cron is stopped?

Or you want to stop cron from running a monitor script while a backup is running on Fridays?

Then, tell cron not to run the script on Friday.

The syntax is ->

So to run a script every day except friday,

crontab -e

* * * * 1,2,3,4,6,7 /path/to/script

Notice I excluded 5 because the 5 represents Friday.

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I have monitoring script which monitors the services with help of cron with regular interval of time. on Friday we have to take the backup of the servers by stopping the services. At the time we will get huge mail alert for the service down. So during the backup window the cron should be stopped and when the backup compeletes it should continue to monitor

Update the script to check the time when it runs, or put in two cron entries, one for all day Saturday to Thursday, and one for 22, 23 hours on friday as required.

Ok, so you can tell cron to run the monitor script each day except Friday like I said. Can you not?

If you really want to turn off cron completely.

Do as root:

at 11:55 AM Fri
> service crond stop
> EOT

Check the job with:

atq

You're backup finishes before 5pm, then as root:

at 5:00 PM Fri
> service crond start
> EOT

Unlike cron, "at" will not run commands on intervals, so these commands will only run one time on Friday, not each Friday after that.

But you can make cron run "at" on intervals. Then use "at -f file", so it doesn't require any user input.

No I dont want to stop the cron entire friday, I want to stop only few hours during the backup window also we have another crons are running in the same server if we completely stop the cron services. It will affect to the other monitoring

Wait...

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read my reply then

crontab -e

* 10 * * 5 kill $(pidof script)
* 14 * * 4 /path/to/script

This will stop the script at 10:00 AM on Friday. Then it will start the script at 2:00 PM Friday

During 10am to 2pm, backup starts and finishes. Adjust the times.

well is this script running constantly via cron, or monitoring once per cron invocation? It's presumably a pretty popor solution if it's persisting for a long period of time from a single cron job.

Sounds like it's running constantly since he needs to stop it for a few hours, and it's not stopping on it's own.

I'd read that that means "the checks need to not be done for a period of time", regardless of how the checks are actaully being executed each time.

Cron is running every 17 minutes, PID I have checked under /var/run/cron.id

17?? how on earth do you run cron every 17 minutes? Do you mean on the 17th minute of each hour?