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Linux Essentials for Cybersecurity, First Edition by William Rothwell, Denise Kinsey

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Chapter 14 Crontab and At

Nobody wants to sit at a computer for 24 hours a day, monitoring the system health and ensuring routine tasks are completed. This is where the automation tools of crontab and at come into play.

By default, any user can create a crontab entry that will result in a daemon executing a program on a routine basis. Regular users make use of this feature to perform routine operations that they would normally have to remember to perform manually. System administrators use this feature to ensure the health and security of the operating system.

However, if you want to execute a program just once in the future, the at system is a better solution. With this feature, you can schedule the execution of a command or a set of commands ...

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