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Editing | Controlling Access Crontab - Exercise

Using crontab on Linux

Objective: Use the crontab command to schedule a system shutdown.

This is a Java applet

This exercise uses a Java applet to simulate a UNIX command line and allows you to practice entering commands. If you do not have Java active in your browser or are behind a firewall that does not allow Java applets, you will not be able to complete this exercise. If you do not see the applet below, click the Submit button to view the exercise solution and continue with the course.

Exercise scoring

This exercise is not scored. When you have completed the exercise, click the OK, I'm Done button to continue with the course.


Taking advantage of periodic processes is vital to effective system management with UNIX. In this exercise, you will use crontab to schedule a system shutdown. Before you can use crontab, you must first assume root privileges. Then, you view the contents of a file that will be the crontab entry source, and finally you will use crontab. Start the simulation below and work through the situation presented.