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4.4. Scheduling processes

4.4.1. Use that idle time!

A Linux system can have a lot to suffer from, but it usually suffers only during office hours. Whether in an office environment, a server room or at home, most Linux systems are just idling away during the morning, the evening, the nights and weekends. Using this idle time can be a lot cheaper than buying those machines you'd absolutely need if you want everything done at the same time.

There are three types of delayed execution:

  • Waiting a little while and then resuming job execution, using the sleep command. Execution time depends on the system time at the moment of submission.

  • Running a command at a specified time, using the at command. Execution of the job(s) depends on system time, not the time of submission.

  • Regularly running a command on a monthly, weekly, daily or hourly basis, using the cron facilities.

The following sections discuss each possibility.

Introducing Linux
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