“Runlevel” as a term defines the state of the machine after booting. The following are the runlevels defined for Unix/Linux systems:-
ID Description
0 Halt
1 Single-user mode
2 Multi-user mode without network services and network interfaces
3 Multi-user mode with networking
4 Not used (Reserved for special purposes)
5 Multi-user mode with networking and GUI
6 Reboot
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