Cron Cheatsheet

Min  Hour Day  Mon  Weekday

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*    *    *    *    *  command to be executed

┬    ┬    ┬    ┬    ┬
│    │    │    │    └─  Day of Week   (0=Sun .. 6=Sat)
│    │    │    └──────  Month         (1..12)
│    │    └───────────  Day of Month  (1..31)
│    └────────────────  Hour          (0..23)
└─────────────────────  Minute        (0..59)

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Field	Range	Special characters
Minute	0 - 59	, - * /
Hour	0 - 23	, - * /
Day of Month	1 - 31	, - * ? / L W
Month	1 - 12	, - * /
Day of Week	0 - 6	, - * ? / L #

Example	Description
*/15 * * * *	Every 15 mins
0 * * * *	Every hour
0 */2 * * *	Every 2 hours
15 2 * * *	At 2:15AM of every day
15 2 * * ?	At 2:15AM of every day
10 9 * * 5	At 9:10AM of every Friday
0 0 * * 0	At midnight of every Sunday
15 2 * * 1L	At 2:15am on the last monday of every month
15 0 * * 4#2	At 00:15am on the second thursday of every month
0 0 1 * *	Every 1st of month (monthly)
0 0 1 1 *	Every 1st of january (yearly)
@reboot	Every reboot (non-standard)

Special String	Meaning
@reboot	Run once, at system startup (non-standard)
@yearly	Run once every year, “0 0 1 1 *” (non-standard)
@annually	(same as @yearly) (non-standard)
@monthly	Run once every month, “0 0 1 * *” (non-standard)
@weekly	Run once every week, “0 0 * * 0” (non-standard)
@daily	Run once each day, “0 0 * * *” (non-standard)
@midnight	(same as @daily) (non-standard)
@hourly	Run once an hour, “0 * * * *” (non-standard)

-	-
crontab -e	Edit or create a crontab file if doesn’t already exist.
crontab -l	Display the crontab file.
crontab -r