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

in dir /etc/cron.d/

new create a file excute_per_30s

* * * * * yourusername  /bin/date >> /home/yourusername/temp/date.txt
* * * * * yourusername sleep 30; /bin/date >> /home/yourusername/temp/date.txt

will run cron every 30 seconds