Systems conforming to the Linux Standard Base (LSB) need not provide the exact run levels given here or give them the meanings described here, and may map any level described here to a different level which provides the equivalent functionality.
| ID | Name | Description |
|---|---|---|
| 0 | Halt | Shut down the System. |
| 1 | Single-user mode | Mode for administrative task. |
| 2 | Muti-user mode | Does not configure network interfaces and does not export network services. |
| 3 | Muti-user mode with networking | Starts the system normally. |
| 4 | Not used/user-definable | For special purposes. |
| 5 | Start the system normally with appropriate display manager (with GUI) | Same as runlevel 3 + display manager. |
| 6 | Reboot | Reboots the system. |