halt(8) - NetBSD Manual Pages

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


NAME

     reboot, halt - stopping and restarting the system


SYNOPSIS

     halt [-dlnpq]
     reboot [-dlnq]


DESCRIPTION

     The halt and reboot utilities flush the file system cache to disk, send
     all running processes a SIGTERM, wait up to 30 seconds for them to die,
     send a SIGKILL to the survivors 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      Create a dump before halting or restarting.  This option is use-
             ful for debugging system dump procedures or capturing the state
             of a corrupted or misbehaving system.

     -l      Send a message via syslog(3) before halting or restarting.

     -n      Do not flush the file system cache.  This option should be used
             with extreme caution.

     -p      Attempt to powerdown the system.  If the powerdown fails, or the
             system does not support software powerdown, the system will halt.
             This option is only valid for halt.

     -q      Do not give processes a chance to shut down before halting or
             restarting.  This option should not normally 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.


SEE ALSO

     syslog(3), utmp(5), boot(8), shutdown(8), sync(8)


BUGS

     The single user shell will ignore the SIGTERM signal.  To avoid waiting
     for the timeout when rebooting or halting from the single user shell, you
     have to exec reboot or exec halt.


HISTORY

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

NetBSD 1.4                     January 20, 1998                              1