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 ?
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.
