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halt(8)


NAME

  halt - Stops the processor


SYNOPSIS

  /usr/sbin/halt [-d] [-l] [-n] [-q] [-y]


OPTIONS

  -d  Generates a crash dump of the system before halting it.  Can be used
      with any other option.

  -l  Does not log the halt using syslog.

  -n  Prevents the sync before stopping, and does not log the halt using
      syslog.

  -q  Causes a quick halt, does not log the halt using syslog, and makes no
      attempt to kill all processes.

  -y  Halts the system from a dial-up operation.


DESCRIPTION

  If other users are logged into the system, or if the system is operating at
  a multiuser run level, use the /usr/sbin/shutdown -h command to halt the
  system.  If only the root user is logged in, and you do not plan to restart
  the system immediately, use the halt command.

  The halt command writes data to the disks and then stops the processor(s),
  but does not reboot the machine.

  You must be the root user to run this command.

  When the system displays the ...Halt completed... message, you can turn off
  power to the machine.

  If the command is invoked without the -l, -n, or -q option, the halt
  program logs the shutdown using the syslogd command and places a record of
  the shutdown in the login accounting file, /var/adm/wtmp.  Using the -q and
  the -n options imply the -l option.


EXAMPLES

   1.  To halt the system without logging the shutdown in the log file,
       enter:
	    halt -l

   2.  To halt the system quickly, enter:
	    halt -q

   3.  To halt the system quickly, also leaving a crash dump for the savecore
       command, enter:
	    halt -d -q

   4.  To halt the system from a dial-up, enter:
	    halt -y


FILES

  /usr/sbin/halt
      Specifies the command path.

  /usr/sbin/syslogd
      Specifies the syslog daemon.

  /var/adm/wtmp
      Specifies the login accounting file.


SEE ALSO

  Commands: fasthalt(8), reboot(8), savecore(8), shutdown(8), syslogd(8)

  Functions: reboot(2), sync(2), syslog(3)

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