Difference between revisions of "Cron"
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Revision as of 13:53, 8 March 2019
Timed execution of commands. The cron daemon is checking the crontab every minute to see if anything needs to be done
- Format of crontab
| minute | hour | day-of-month | month | day-of-week | command |
|---|---|---|---|---|---|
| 1-59 | 1-23 | 1-31 | 1-12 | 0-7 | doit |
In scheduling fields (all except the command) following applies:
- * means each tick is matched.
- A range is defined by a dash. E.g. 2-5 in minute -> execute command on minute 2,3,4 and 5
- A list is defined by comma's E.g. 2,4,6 in minute -> execute command on minute 2, 4 and 6
- For month and day-of-week also names can be used by giving the first 3 characters (case insensitive)
Example:
Every Sunday at noon execute my script:
00 12 * * sun /usr/local/bin/myscript.sh
- crontab -l
- List the current crontab