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Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition by Paul Hudson, Andrew Hudson, Matthew Helmke

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System Services and Runlevels

The init command traditionally boots a Linux system to a specific system state, commonly referred to as its runlevel.

Runlevels determine which of the many available system services are started, as well as in which order they start. A special runlevel is used to stop the system, and a special runlevel is used for system maintenance. As you will see, there are other runlevels for special purposes.

You traditionally use runlevels to manage the system services running on a Linux computer. All these special files and scripts are set up during installation, but you can change and control them manually.

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