Linux it has 6 Run level
Run level 0 for halt
1 for single user mode
2 multi user mode without NFS
3 Fully multi user mode with NFS
4 not used
5 x11 graphical mode
6 reboot
You can see the runlevel following files
#vim /etc/inittab
In these file 18th line it contain code
id:5:initdefault:
You can change these default run level
id:yourunlevel:initdefault
After change it save and quit then you can switch the runlevel
Linux every run level present in following directory
/etc/rc.d/
In these directory it contain the file six runlevel script directory
rco.d , rc1.d, rc2.d…rc5.d, rc6.d
Start the specified runlevel | switch Run level
If you like to run level 1 means you can use inittab command type the following command
#inittab 1
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