| 0 | Halt the system. |
| 1 | Single-user mode |
| 2 | Local Multiuser with Networking but without network service |
| 3 | Full Multiuser with Networking |
| 4 | For Testing Purpose |
| 5 | Full Multiuser with Networking and X Windows |
| 6 | Reboot |
How to Find Out Current Run Level Command
There are 7 run levels in linux as listed above, To check the current Run Level use the command:
# who -r run-level 3 2015-01-03 08:10
OR
# cat /etc/inittab id:3:initdefault:
How to Change Run Level Command
In order to change the run level in linux use init command:
# init 1