Add, Edit, Delete, List cronjobs in Linux

If you want to add cronjob or edit an existing one you can use the crontab command:

#crontab -e

The ‘-e’ param stands for edit. This will open the crontab file for the current logged user. If you want to edit the crontab file for a specific user you need to specify the username:

#crontab -e -u username

Source: http://linuxapachemysqlphp5.blogspot.com/2013/05/add-edit-delete-list-cronjobs-in-linux.html