CRONTAB – Predefined scheduling definitions

Predefined scheduling definitions

There are several special predefined values which can be used to substitute the CRON expression.

Entry Description Equivalent To
@yearly (or @annually) Run once a year, midnight, Jan. 1st 0 0 1 1 *
@monthly Run once a month, midnight, first of month 0 0 1 * *
@weekly Run once a week, midnight on Sunday 0 0 * * 0
@daily Run once a day, midnight 0 0 * * *
@hourly Run once an hour, beginning of hour 0 * * * *
@reboot Run at startup

 

*    *    *    *    *  command to be executed
┬    ┬    ┬    ┬    ┬
│    │    │    │    │
│    │    │    │    │
│    │    │    │    └───── day of week (0 - 6) (0 is Sunday, or use names)
│    │    │    └────────── month (1 - 12)
│    │    └─────────────── day of month (1 - 31)
│    └──────────────────── hour (0 - 23)
└───────────────────────── min (0 - 59)
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