crontab.md

Crontab

Syntax

┌───────────── minute (0 - 59)
│ ┌───────────── hour (0 - 23)
│ │ ┌───────────── day of month (1 - 31)
│ │ │ ┌───────────── month (1 - 12)
│ │ │ │ ┌───────────── day of week (0 - 6) (Sunday to Saturday;
│ │ │ │ │                                       7 is also Sunday on some systems)
│ │ │ │ │
│ │ │ │ │
* * * * *  command to execute

* = every

*/n = every n.

x,y,z = every x, y, z

Examples

0 5 * * * /usr/bin/backup.sh

Every morning 5am (minute == 0 & hour == 5)

*/10 * * * * /usr/bin/runsomething.sh

Every 10 minutes

0 8,17 * * * /usr/bin/runsomething.sh

On 8am and 5pm