> Is there any way to change security back from 1 to 0?
> 
> As you know, it always says the last line of the boot "Changing kernel
> security level from 0 to 1." or something.

Sure, it's rather easy.  Either su to root and type:

shutdown now

or else compile your own kernel with options INSECURE to stay in
securelevel 1 while in multiuser.

Either way, why would you want to do such a thing?

Later.

-- 
Colin Wood                                      ender@is.rice.edu
Consultant                                        Rice University
Information Technology Services                       Houston, TX