The cron command-line utility is a job scheduler on Unix-like operating systems. Users who set up and maintain software environments use cron to schedule jobs[1] (commands or shell scripts), also known as cron jobs,[2][3] to run periodically at fixed times, dates, or intervals.[4] It typically automates system maintenance or administration—though its general-purpose nature makes it useful for things like downloading files from the Internet and downloading email at regular intervals.[5]
Cron is most suitable for scheduling repetitive tasks. Scheduling one-time tasks can be accomplished using the associated at utility.
Cron's name originates from Chronos, the Greek word for time.[6][better source needed]
^"Automation with Cron job on Centos 8". April 6, 2020.
^"Difference between cron, crontab, and cronjob?". Stack Overflow.
^"Cron Job: a Comprehensive Guide for Beginners 2020". May 24, 2019.
^"Crontab – Quick Reference". Admin's Choice. December 21, 2009.
^"Newbie Introduction to cron". Unixgeeks.org. Retrieved 2013-11-06.
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