what is a  cron job
What is a Cron Job? Cron is a standard Linux feature that allows you to schedule tasks, called Cron Jobs, to run unattended at a specified frequency. For example, you can set the frequency of a job to run twice an hour, Mondays at 8:00 a.m., or weekdays at 12:00 p.m. and 6:00 p.m.