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

NAME
     reboot, halt - stopping and restarting the system

SYNOPSIS
     halt [-dnpq]
     reboot [-dnq]

DESCRIPTION
     The halt and reboot utilities flush the file system cache to disk, run
     the system shutdown script, send all running processes a SIGTERM (and
     subsequently a SIGKILL), and, respectively, halt or restart the system.
     The action is logged, including entering a shutdown record into the login
     accounting file.

     The options are as follows:

     -d      Causes system to create a dump before rebooting.  This option is
             useful for debugging system dump procedures or capturing the
             state of a corrupted or misbehaving system.  See savecore(8) for
             information on how to recover this dump.

     -n      Prevent file system cache from being flushed.  This option should
             probably not be used.

     -p      Causes the system to power down, if it is being halted, and the
             hardware supports automatic power down.

             See also the description of powerdown, below.

     -q      Quick.  The system is halted or restarted quickly and
             ungracefully, and only the flushing of the file system cache is
             performed.  This option should probably not be used.

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

FILES
     /etc/rc.shutdown  Script which is run at shutdown time.  If it sets the
                       variable powerdown to ``YES'', halt will attempt to
                       power down the machine after it has halted.

SEE ALSO
     reboot(2), utmp(5), boot_alpha(8), boot_amd64(8), boot_hp300(8),
     boot_hppa(8), boot_hppa64(8), boot_i386(8), boot_luna88k(8),
     boot_mac68k(8), boot_macppc(8), boot_mvme68k(8), boot_mvme88k(8),
     boot_sparc(8), boot_sparc64(8), boot_vax(8), boot_zaurus(8),
     rc.shutdown(8), savecore(8), shutdown(8), sync(8)

HISTORY
     A reboot command appeared in Version 6 AT&T UNIX.

OpenBSD 4.9                    November 19, 2007                   OpenBSD 4.9