Cron tabs: create and delete

**Cron jobs run as root can be created with **

sudo crontab -e

**Cron jobs run as logged in user can be created with **

crontab -e

**Existing cron jobs can be viewed by writing **

sudo crontab -u username -l

**Deleting all cron jobs on a user can be done by typing **

sudo crontab -u username -r

http://askubuntu.com/questions/2368/how-do-i-set-up-a-cron-job