Table 9.1. Runlevels in Red Hat Enterprise Linux
| Runlevel | Description |
|---|---|
0 | Used to halt the system. This runlevel is reserved and cannot be changed. |
1 | Used to run in a single-user mode. This runlevel is reserved and cannot be changed. |
2 | Not used by default. You are free to define it yourself. |
3 | Used to run in a full multi-user mode with a command line user interface. |
4 | Not used by default. You are free to define it yourself. |
5 | Used to run in a full multi-user mode with a graphical user interface. |
6 | Used to reboot the system. This runlevel is reserved and cannot be changed. |
