General name: HALT
These run level halts or stop the system
Rulevel 1
SINGLE USER MODE
This run level is single user mode and offer root bash shell with no other software is running.
Runlevel 2
MULTIUSER MODE
Perform Multi User mode without NFS (Network File System)
Runlevel 3
EXTENDED MULTI USER MODE
Offer extended full multi user mode with text login
Run level 4
NOT USED
Run level 5
GRAPHICAL MODE
Level 5 off full Multi-user mode with graphical Xll login
Run level 6
REBOOT
Performing Rebooting in the Linux system
These are the red hat Linux run level and there application
These run level and there application is not same for all Linux distribution.
Example: Red hat Linux run level 0 is shut down but in the sun’s Solaris OS shutdown function is performed by run level 5