What is a runlevel?

What is a runlevel?

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A runlevel is a state, or mode, of the Linux operating system on which it is running. When a computer running Linux is booted, it boots at a default runlevel. The default runlevel is 3 or 5. The Linux operating system supports the runlevels described in the table below:

Runlevel	Description
0	Halts the system
1	Single-user mode
2	Multi-user mode (without NFS)
3	Multi-user mode
5	Multi-user mode with graphical login support
6	Reboots the system

The INIT command is used to change the runlevel of a system. It is the first program started by a Linux system and is responsible for starting and stopping all the processes based on a runlevel.

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