Format for cron jobs
mi h d m w command
Run at ten minutes past the hour, every hour, day etc.
10 * * * * ls
Run every five minutes, on the 6th hour, every day etc.
*/5 6 * * * ls
Run on the 14th, 29th, 44th and 59th minute of every hour etc.
14,29,44,59 * * * * ls