What is cron?
It is the scheduling daemon of the Linux operating system
Cron jobs allow you to automate repetitive tasks on the server that hosts your web site. This is a powerful tool that allows you to take a hands-free approach to repetitive tasks.
There are two different modes you can use to add a cron job:
Standard – Provides a range of pre-set options that you can choose. This is the simplest method and is recommended.
Advanced (Unix Style) – Provides the regular Unix style cron options. Recommended for users who are used to this method of entering cron entries.
To add or modify a cron job:
Click on the Cron jobs button on the home page.
If you want to use the Standard mode, click on the Standard button.
Enter the e-mail address to send the results of running the cron job in the top field.
Enter the command the you want to run in the Command to run field.
Click on one option from each of the available lists.
Click on the Save Crontab button. Your cron job has now been added or updated.