
o runleve and "init" program

 A runlevel is a software configuration of the system which
       allows  only  a selected group of processes to exist.  The
       processes spawned by init for each of these runlevels  are
       defined  in  the /etc/inittab file.  Init can be in one of
       eight runlevels: 0-6 and S or s.  The runlevel is  changed
       by  having  a  privileged  user  run  telinit, which sends
       appropriate signals to init, telling it which runlevel  to
       change to.

o runlevel in muLinux (/etc/rc.* files)

o:	halt
1:	limbo level
2:	------	
3:  	------		
4:	full setup 
5:	servers, daemons, XWindow, ...		
6:	shutdown

o Single user mode

	# init s

This kill all process.

o Shutdown & reboot

	# init 6

o "Soft" shutdown

	# init s
	# init 5

o Halt

	# init 0
