[no subject]

       0,1,2,3,4,5 or 6
              tell init to switch to the specified run level.

       a,b,c  tell init to process only those  /etc/inittab  file
              entries having runlevel a,b or c.

       Q or q tell init to re-examine the /etc/inittab file.

       S or s tell init to switch to single user mode.

       U or u tell  init  to  re-execute  itself  (preserving the
              state). No re-examining of /etc/inittab  file  hap-
              pens. Run level should be one of Ss12345, otherwise
              request would be silently ignored.