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Runlevel is normally defined as the state where the machine is to run once the booting process completed. There exists 7 runlevels in linux from 0 to 6.
0 - Shuts down the machine
1 - For loading single user mode
2 - For Multi-user mode without network setup
3 - Same as 2 with network setup
4 - Not assigned
5 - Same as 3 with GUI
6 - Reboot the machine
To change from one runlevel to another while using, just use # init command with the required runlevel.
Whereas to permanently change the run level, go to /etc/inittab file and change the value as shown below,
id:1:initdefault:
Once you set 1 in this file, save and restart the machine. It will automatically loads to that runlevel.
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