Q1. What is runlevel ?
A runlevel is a preset operating state on a Unix-like operating system. A system can be booted into (i.e., started up into) any of several runlevels, each of which is represented by a single digit integer. Each runlevel designates a different system configuration and allows access to a different combination of processes
Q2. How many runlevels are there in Linux?
There are 7 runlevels in linux ( 0-6 )
Q3. Describe the different runlevels?
0 – Halt
1 – Single-User mode
2 – Multi-User mode with network enabled, but most network services
3 – Multi-User mode, console logins only
4 – Not used/User-definable
5 – Multi-User mode, with display manager as well as console logins
6 – Reboot