halt - abruptly stop the system
Halt stops the system almost immediately. The users are not informed
about the things to come. Halt is logged in /usr/adm/wtmp and by
syslog(3) (level auth.notice), if these files exist. Halt should only be
run by the super-user, any other caller will be refused.
Halt is a rather rude program. Shutdown(8) is preferred for it performs
a more gentle halt routine.
Halt -f is even worse, it omits the terminate signals that are normally
sent first to all processes to give them a chance to die peacefully.
reboot(2), syslog(3), shutdown(8), reboot(8), boot(8).
Edvard Tuinder (email@example.com.NL)