Running a cron every 30 seconds

Question

Ok so I have a cron that I need to run every 30 seconds.

Here is what I have:

*/30 * * * * /bin/bash -l -c \'cd /srv/last_song/releases/2012030813315         


        

Answer 1

Cron's granularity is in minutes and was not designed to wake up every x seconds to run something. Run your repeating task within a loop and it should do what you need:

#!/bin/env bash
while [ true ]; do
 sleep 30
 # do what you need to here
done