Crontab is a utility found on Linux and UNIX that allows you to schedule repetitive tasks on your system, like backups, updates, etc.

The crontab command manages a table containing specially formatted lines of text which is processed periodically by the system. Each line consists of a “schedule” followed by one or more commands to be processed at the scheduled time.

If you want to use the vim, emacs or nano editor for editing cron jobs, then, set the following in your environment and in your ~/.bash_profile file: