1.\" $OpenBSD: reboot.8,v 1.24 2001/10/27 04:32:51 pvalchev Exp $ 2.\" $NetBSD: reboot.8,v 1.3 1995/10/05 05:36:21 mycroft Exp $ 3.\" 4.\" Copyright (c) 1990, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)reboot.8 8.1 (Berkeley) 6/9/93 36.\" 37.Dd June 9, 1993 38.Dt REBOOT 8 39.Os 40.Sh NAME 41.Nm reboot , 42.Nm halt 43.Nd stopping and restarting the system 44.Sh SYNOPSIS 45.Nm halt 46.Op Fl dnpq 47.Nm reboot 48.Op Fl dnq 49.Sh DESCRIPTION 50The 51.Nm halt 52and 53.Nm reboot 54utilities flush the file system cache to disk, run the system 55shutdown script, send all running processes a 56.Dv SIGTERM 57.Pq and subsequently a Dv SIGKILL , 58and, respectively, halt or restart the system. 59The action is logged, including entering a shutdown record into the login 60accounting file. 61.Pp 62The options are as follows: 63.Bl -tag -width Ds 64.It Fl d 65Causes system to create a dump before rebooting. 66This option is useful for debugging system dump procedures or 67capturing the state of a corrupted or misbehaving system. 68See 69.Xr savecore 8 70for information on how to recover this dump. 71.It Fl n 72Prevent file system cache from being flushed. 73This option should probably not be used. 74.It Fl q 75Quick. 76The system is halted or restarted quickly and ungracefully, and only 77the flushing of the file system cache is performed. 78This option should probably not be used. 79.It Fl p 80Causes the system to power down, if it is being halted, and the 81hardware supports automatic power down. 82(Currently supported on some i386, mac68k, macppc, sparc and sparc64 platforms.) 83.El 84.Pp 85Normally, the 86.Xr shutdown 8 87utility is used when the system needs to be halted or restarted, giving 88users advance warning of their impending doom. 89.Sh FILES 90.Bl -tag -width /etc/rc.shutdown -compact 91.It Pa /etc/rc.shutdown 92script which is run at shutdown time 93.El 94.Sh SEE ALSO 95.Xr utmp 5 , 96.\" .Xr boot 8 , 97.Xr boot_alpha 8 , 98.Xr boot_amiga 8 , 99.Xr boot_hp300 8 , 100.Xr boot_i386 8 , 101.Xr boot_mac68k 8 , 102.\" .Xr boot_macppc 8 , 103.\" .Xr boot_mvme68k 8 , 104.\" .Xr boot_mvmeppc 8 , 105.Xr boot_sparc 8 , 106.\" .Xr boot_sparc64 8 , 107.Xr boot_sun3 8 , 108.Xr boot_vax 8 , 109.Xr rc.shutdown 8 , 110.Xr savecore 8 , 111.Xr shutdown 8 , 112.Xr sync 8 113.Sh HISTORY 114A 115.Nm reboot 116command appeared in 117.At v6 . 118