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A run level is the operating state of the operating system. Run levels can be: "halt", "single user mode", "multi-user mode", "reboot", "graphical user interface mode/display manger" and others. Each run level starts or kills a set of processes and is denoted by a number typically from 0 to 6. Different operating systems may define different run levels.

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I know that, run level=0 => Halt/Shuts down system run level=1 => Single-User Mode run level=2 => Multi-User Mode run level=3 => Multi-User Mode with Networking run level=4 => …
asked Mar 11 '17 by IAmSurajBobade