The init is a program that init-ializes the operating system. It runs during the boot-up. I'm not sure what init 1, 2, 3 or 5 is. I know what runlevels 1,2,3 and 5 are, though. Runlevel 1 is single-user mode [only the most basic system services initialized and a root shell opened], runlevels 2 and 3 are multi-user modes (with or without NFS) [everything initialized, but only the text prompt is opened], runlevel 5 is graphical mode [all servers and services started, goes into graphical login screen]. You can configure /etc/inittab to boot into either one of these runlevels. Maybe this is what it means, though I'm not sure.
<edit> Didn't see the previous post when I wrote this. </edit>
Last edited by mbegovic; 04-18-2004 at 09:12 PM.