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Here is the typical field layout for a crontab entry (or multiple entries):
<pre>
.---------------- minute (0 - 59)<br>
| .------------- hour (0 - 23)<br>
| | | | |<br>
* * * * * command to be executed<br>
</pre>
The asterisk (*) indicate to run for that unit of time. Below is an example of crontab entries:
