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 shell commands to run at a given schedule.
Each line of a crontab file represents a job, and looks like this:
# ┌───────────── minute (0 - 59) # │ ┌───────────── hour (0 - 23) # │ │ ┌───────────── day of the month (1 - 31) # │ │ │ ┌───────────── month (1 - 12) # │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday; # │ │ │ │ │ 7 is also Sunday on some systems) # │ │ │ │ │ # │ │ │ │ │ # * * * * * <command to execute>