Standard Semantics of Runlevels

The ksysv Handbook
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# 4.2. Standard Semantics of Runlevels

These vary by distribution, so IŽll just list them all (note that this list is by no means comprehensive, so please send me a mail, if you know what the different runlevels do for a distribution not included in this list.

## 4.2.1. Red Hat

- Runlevel 0: halt (shuts down the machine)

- Runlevel 1: Single user mode (can be entered by typing Ž`linux single`Ž at the `LILO:` prompt)

- Runlevel 2: Multi user text-only, without NFS

- Runlevel 3: Multi user text-only, with full networking (this is the default runlevel)

- Runlevel 4: Not used

- Runlevel 5: Multi user X11, with full networking

- Runlevel 6: reboot

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