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Cron is the system scheduler on Unix/Linux/Mac operating systems. The ''crontab'' is the schedule of actions that the machine must keep. There are two types of crontabs in place on most systems: ''user crontabs'' and the ''system crontab''.
{{highlight|text=dates and times are critically important to the proper function of a computer. Be sure to setup and configure the Network Time Protocol Daemon [[NTP]]}}
== Avoid User Crons ==
* Use <code>crontab -e</code> to edit the crontab for the current user
* <code>man crontab</code> can provide a lot more information.
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