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How to schedule Crontabs


Crontab is used to schedule, load or remove scripts. You can schedule your scripts depending upon your needs. Syntax of scheduling a script differs upon time. Some basic commands of crontab are

# crontab -l (List crontabs)

# crontab -r (Removes the crontab file)

# crontab -e (Edit the contab file)

You can use crontab -e to add and remove or comment out the scripts, basic syntax for crontabs will be like the following

* * * * * /tmp/

The "*" sign holds a very important value as it every * has some value and you can schedule your crons depending upon the value of *

*               *                       *                          *                     *

min           hr              day of month             month           day of week

So these five values can be set by putting your desired values

Now we will see some examples

Lets suppose we want to execute a script on the first date of every month at 00:45

45 * 1 * *  /tmp/

If we want to execute a script from Monday to Friday and from 9AM to 4PM it will be written as

00 09-16 * * 1-5 /tmp/

Michael Dudli

Cloud Specialist with more than 10 years experience in the Hosting Business.



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