REBOOT(8) BSD System Manager's Manual REBOOT(8)

NAME
     rreebboooott, hhaalltt - stopping and restarting the system

SYNOPSIS
     hhaalltt [-llnnqquu]
     rreebboooott [-llnnqq]

DESCRIPTION
     The hhaalltt and rreebboooott utilities flush the file system cache to disk, send
     all running processes a SIGTERM (and subsequently a SIGKILL) and, respec-
     tively, halt or restart the system.  The action is logged, including
     entering a shutdown record into the wtmp(5) file.

     When the system is halted with the halt command, the system is powered
     off.

     The options are as follows:

     -ll      The halt or reboot is not logged to the system log.  This option
             is intended for applications such as shutdown(8), that call
             rreebboooott or hhaalltt and log this themselves.

     -nn      The file system cache is not flushed.  This option should proba-
             bly not be used.

     -qq      The system is halted or restarted quickly and ungracefully, and
             only the flushing of the file system cache is performed (if the
             -nn option is not specified).  This option should probably not be
             used.

     -uu      The system is halted up until the point of removing system power,
             but waits before removing power for 5 minutes so that an external
             UPS (uninterruptible power supply) can forcibly remove power.
             This simulates a dirty shutdown to permit a later automatic power
             on. OS X uses this mode automatically with supported UPSs in
             emergency shutdowns.

     Normally, the shutdown(8) utility is used when the system needs to be
     halted or restarted, giving users advance warning of their impending doom
     and cleanly terminating specific programs.

SEE ALSO
     wtmp(5), shutdown(8), sync(8)

HISTORY     A rreebboooott utility appeared in Version 6 AT&T UNIX.

BSD                              June 9, 1993                              BSD