cron in increments less than 1 minute?

[RobertCarback]

Is it possible to use cron to run a job every 30 seconds?

[James R. Ferguson · Accepted solution]

Hi Robert:

The minimum granularity for crontasks is every minute. The only way you could accomplish this is to initiate your own script with a 30-second loop. Ths script would look like:

#/usr/bin/sh
while true
do

sleep 30
done

Regards!

...JRF...

[Patrick Wallek]

No, it is not.

The only thing I can think of to do is something like:

while true
do
do your stuff here
do more stuff here
do even more stuff here
sleep 30
done

This would run your script, sleep 30 seconds and run again.

You could start this via at after the system reboots or via a startup script in /sbin/rc3.d after everything else starts.

[RobertCarback]

thanks. that answers my question