how many runlevel in Unix like operating system | runlevel in linux

how many runlevel in Unix like operating system | runlevel in linux

Question : how many runlevel in Unix like operating system ?
Question : what is runlevel ? 
Question : type of runlevel ?
Question : how to change runlevel in Linux ?
Question : what is a default runleve in linux ? 

how many runlevel in Unix like operating system,  what is runlevel , type of runlevel ?, how to change runlevel in Linux,  what is a default runleve in linux, default runlevel, runlevel, linuxtopic, linux topic, lokesh carpenter

Where the Unix-based operating system Run, Called a runlevel. There are 7 runlevels exist in Linux. Each runlevel has a certain number of services stopped or services started, giving the user control over the behavior of the machine.

Total 7  runlevel, 0 to 6  in Linux

0 - hault - shutdown
1 - single user mode
2 - multiuser mode
3 - multiuser with networking
4 - user define
5 - x11 / GUI
6 -  reboot


We can change / switch runlevel using init commad for the example we have to power off  machine we run command "init 0" (Shutdown),

init 0
 To switch multi-user mode with networking :

init 3 

To Switch GUI/X11

init 5

To Restart

init 6
default runlevel of linux is 3 or 5, we can change the runleve by edit inittab file, you may find initdefault line and update runlevel.

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