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		1	# Cron
1		2
		3	The software utility cron is a time-based job scheduler in Unix-like
		4	computer operating systems. People who set up and maintain software
		5	environments use cron to schedule jobs (commands or shell scripts) to
		6	run periodically at fixed times, dates, or intervals. It typically
		7	automates system maintenance or administration---though its
		8	general-purpose nature makes it useful for things like connecting to the
		9	Internet and downloading email at regular intervals.
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		11	Cron is driven by a crontab (cron table) file, a configuration file that
		12	specifies shell commands to run periodically on a given schedule. The
		13	crontab files are stored where the lists of jobs and other instructions
		14	to the cron daemon are kept. Users can have their own individual crontab
		15	files and often there is a system wide crontab file (usually in /etc or
		16	a subdirectory of /etc) that only system administrators can edit.
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		18	* * * * * command to execute
		19	┬ ┬ ┬ ┬ ┬
		20	│ │ │ │ │
		21	│ │ │ │ │
		22	│ │ │ │ └──── day of week (0 - 6) (0 to 6 are Sunday to Saturday, or use names)
		23	│ │ │ └─────── month (1 - 12)
		24	│ │ └────────── day of month (1 - 31)
		25	│ └───────────── hour (0 - 23)
		26	└──────────────── min (0 - 59)
		27
		28	[Cron article on Wikipedia ](http://en.wikipedia.org/wiki/Cron)

Edited by litecart on 29 gruod. 2023 at 04:28