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What is cron?
cron...
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a daemon, i.e. it runs in background all the time
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checks a certain set of files every minute
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executes the programs listed for that minute
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used for commands that are to be executed repeatedly
What ISN'T cron?
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at - a command that will execute a command (usually once) at a given time
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anacron - a command like cron that will execute commands at sometime in a given interval
