Cron
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Cron
What Is Cron?
Cron is a unix time based job scheduler tool.
Overview
Crontab Syntax
Cron Expression Table
Cron actions are driven by a crontab file, also known as a cron table. The user's crontab file is a configuration file that specifies specific shell commands to run at a given schedule.
Each line of a crontab file represents a job, and looks like this: