cron
cron / crontab
User crontab config file
/var/spool/cron/crontabs/<user>
crontab config file
/etc/crontab
Debian only
/etc/cron.d/
info
- Use the standard system crontab
/etc/crontab
crontab format
# minute hour day month week command
0 10-12 * * * echo "10:00 11:00 12:00"
30 10,20 * * * echo "10:30 20:30"
*/10 * * * * echo "Every 10 minutes"
| Range | |
|---|---|
| minute | 0 - 59 |
| hour | 0 - 23 |
| day | 1 - 31 |
| month | 1 - 12 |
| week | 0 - 6, 0 = Sunday |
| Symbol | Description |
|---|---|
* | Wildcard, specifies every possible time interval |
, | List multiple values separated by a comma |
- | Specify a range between two numbers, separated by a hyphen |
/ | Specify a periodicity/frequency using a slash |