crontab
A crontab line should point to a .sh script. The .sh script can then execute the shell script. This enables you to use either the sleep funciton or looping constructs to run the script a multiple of times if you like, and  keeps your command to one line inside the cron.
Look at your crontab with #crontab -l edit it with #crontab -e
Crontab time examples:|
1 */3 * * *  every 3 hours, one minute after the hour. Where possible, dont run a crontab exactly on the hour, because that is when everybody else does it on a shared host. Set it for a minute after when the cpu isnt likely to be so taxed.
1 0,12 * * * every 12 hours, one minute after the hour.
*/1 * * 3/6 every minute on every third and sixth day of the week

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