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

  To delete user's crontab use the following command:

#crontab -r

or for a specific user:

#crontab -r -u username

To list cronjob:

#crontab -l

 or

 #crontab -l -u username

When you edit the crontab file, it will be open in your default editor. If you want to be open in a specific editor you can use the env command:

#env EDITOR=nano crontab -e

This will open the crontab file in nano editor.