Linux Standard Base specification
Solaris
| ID | Name | Description |
|---|---|---|
| 0 | Halt | Shuts down the system. |
| 1 | Single-user Mode | Mode for administrative tasks. |
| 2 | Multi-user Mode | Does not configure network interfaces and does not export networks services. |
| 3 | Multi-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 ) | As runlevel 3 + display manager. |
| 6 | Reboot | Reboots the system. |
Debian GNU/Linux
| ID | Description |
|---|---|
| S | Only run on boot (replaces /etc/rc.boot) |
| 0 | Halt |
| 1 | Single-user mode |
| 2-5 | Full Multi-user with console logins and display manager if installed |
| 6 | Reboot |
Red Hat Linux and Fedora
| Code | Information |
|---|---|
| 0 | Halt |
| 1 | Single-user mode |
| 2 | Multi-user mode console logins only (without networking) |
| 3 | Multi-user mode, console logins only |
| 4 | Not used/User-definable |
| 5 | Multi-user mode, with display manager as well as console logins (X11) |
| 6 | Reboot |
SUSE Linux
| ID | Description |
|---|---|
| 0 | Halt |
| 1 or S | Single-user mode |
| 2 | Multi-user mode without networking |
| 3 | Multi-user mode, console logins only |
| 4 | Not used/User-definable |
| 5 | Multi-user mode with display manager |
| 6 | Reboot |
Slackware Linux
| ID | Description |
|---|---|
| 0 | Halt |
| 1 | Single-user mode |
| 2 | Unused but configured the same as runlevel 3 |
| 3 | Multi-user mode without display manager |
| 4 | Multi-user mode with display manager |
| 5 | Unused but configured the same as runlevel 3 |
| 6 | Reboot |
Arch Linux
| ID | Description |
|---|---|
| 0 | Halt |
| 1 | Single-user (Maintenance Mode) |
| 2 | Not used |
| 3 | Multi-user |
| 4 | Not used |
| 5 | Multi-user with X11 |
| 6 | Reboot |
Gentoo Linux
| ID | Description |
|---|---|
| 0 | Halt |
| 1 or S | Single-user mode |
| 2 | Multi-user mode without networking |
| 3 | Multi-user mode |
| 4 | Aliased for runlevel 3 |
| 5 | Aliased for runlevel 3 |
| 6 | Reboot |
Unix:
System V Releases 3 and 4
| ID | Description |
|---|---|
| 0 | Shut down system, power-off if hardware supports it (only available from the console) |
| 1 | Single-user mode, all filesystems unmounted but root, all processes except console processes killed |
| 2 | Multi-user mode |
| 3 | Multi-user mode with RFS (and NFS in Release 4) filesystems exported |
| 4 | Multi-user, User-definable |
| 5 | Halt the operating system, go to firmware |
| 6 | Reboot |
| s, S | Identical to 1, except current terminal acts as the system console |
| ID | Description |
|---|---|
| 0 | Operating system halted; (SPARC only) drop to OpenBoot prompt |
| S | Single-user mode with only root filesystem mounted (as read-only) -- Solaris 10+: svc:/milestone/single-user |
| 1 | Single-user mode with all local filesystems mounted (read-write) |
| 2 | Multi-user mode with most daemons started – Solaris 10+: svc:/milestone/multi-user |
| 3 | Multi-user mode; identical to 2 (runlevel 3 runs both /sbin/rc2 and /sbin/rc3), with filesystems exported, plus some other network services started. -- Solaris 10+: svc:/milestone/multi-user-server |
| 4 | Alternative Multi-user mode, User-definable |
| 5 | Shut down, power-off if hardware supports it |
| 6 | Reboot |
HP-UX
| ID | Description |
|---|---|
| 0 | System halted |
| S | Single-user mode, booted to system console only, with only root filesystem mounted (as read-only) |
| s | Single-user mode, identical to S except the current terminal acts as the system console |
| 1 | Single-user mode with local filesystems mounted (read-write) |
| 2 | Multi-user mode with most daemons started and Common Desktop Environment launched |
| 3 | Identical to runlevel 2 with NFS exported |
| 4 | Multi-user mode with VUE started instead of CDE |
| 5, 6 | Not used/User-definable |
AIX
| ID | Name | Description |
|---|---|---|
| 0 | reserved | |
| 1 | reserved | |
| 2 | Normal Multi-user mode | default mode |
