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# Cron
An overview of using Ubuntu's built in Cron system.
An overview of using Ubuntu's built in Cron system.
```
[minute] [hour] [day_of_month] [month] [day_of_week] [user] [command_to_run]
* * * * * root /root/update.sh
```
| Field | Values allowed |
| --- | --- |
| Minute | 0 to 59 |
| Hour | 0 to 23 |
| Day of month | 1 to 31 |
| Month | 1 to 12 OR JAN to DEC |
| Day of week | 0 to 6 OR SUN to SAT |