3 halt \- abruptly stop the system
8 stops the system almost immediately. The users are not informed about
17 should only be run by the super-user, any other caller will be refused.
20 is a rather rude program.
22 is preferred for it performs a more gentle halt routine.
25 is even worse, it omits the terminate signals that are normally
26 sent first to all processes to give them a chance to die peacefully.
33 Edvard Tuinder (v892231@si.hhs.NL)