ID	Name	Description
0	Halt	Shuts down the system.
1	Single-user mode	Mode for administrative tasks.
2	Multi-user mode	Does not configure network interfaces and does not export networks services.
3	Multi-user mode with networking	Starts the system normally.
4	Not used/user-definable	For special purposes.
5	Start the system normally with appropriate display manager (with GUI)	Same as runlevel 3
6	Reboot	Reboots the system.

Visit https://en.wikipedia.org/wiki/Runlevel for more.

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