<!-- Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2013 The President and Fellows of Harvard College. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the University nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. --> <html> <head> <title>halt</title> <body bgcolor=#ffffff> <h2 align=center>halt</h2> <h4 align=center>OS/161 Reference Manual</h4> <h3>Name</h3> <p> halt - halt system </p> <h3>Synopsis</h3> <p> <tt>/sbin/halt</tt> </p> <h3>Description</h3> <p> <tt>halt</tt> shuts the system down. A clean shutdown is performed, flushing buffers to disk, unmounting filesystems, and so forth. </p> <p> Once shutdown is complete, <tt>halt</tt> stops execution of the operating system. What this entails depends on the platform. On platforms with a hardware boot monitor, it normally returns to the boot monitor. On software-based platforms, such as System/161, it normally terminates the software simulation. On other platforms the system will generally wait for a keystroke on the console and then reboot. </p> <h3>Requirements</h3> <p> <tt>halt</tt> uses the <A HREF=../syscall/reboot.html>reboot</A> system call. </p> <p> <tt>halt</tt> will function properly even before you do any work on OS/161. </p> <h3>See Also</h3> <p> <A HREF=../bin/sync.html>/bin/sync</A><br> <A HREF=reboot.html>reboot</A>, <A HREF=poweroff.html>poweroff</A> </p> </body> </html>