1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)reboot.8 8.1 (Berkeley) 6/9/93 33.\" $FreeBSD: src/sbin/reboot/reboot.8,v 1.10.2.7 2003/02/23 22:42:10 trhodes Exp $ 34.\" $DragonFly: src/sbin/reboot/reboot.8,v 1.3 2005/08/01 01:49:17 swildner Exp $ 35.\" 36.Dd June 9, 1993 37.Dt REBOOT 8 38.Os 39.Sh NAME 40.Nm reboot , 41.Nm halt , 42.Nm fastboot , 43.Nm fasthalt 44.Nd stopping and restarting the system 45.Sh SYNOPSIS 46.Nm halt 47.Op Fl lnqp 48.Op Fl k Ar kernel 49.Nm 50.Op Fl dlnqp 51.Op Fl k Ar kernel 52.Nm fasthalt 53.Op Fl lnqp 54.Op Fl k Ar kernel 55.Nm fastboot 56.Op Fl dlnqp 57.Op Fl k Ar kernel 58.Sh DESCRIPTION 59The 60.Nm halt 61and 62.Nm 63utilities flush the file system cache to disk, send all running processes 64a 65.Dv SIGTERM 66(and subsequently a 67.Dv SIGKILL ) 68and, respectively, halt or restart the system. 69The action is logged, including entering a shutdown record into the 70.Xr wtmp 5 71file. 72.Pp 73The options are as follows: 74.Bl -tag -width indent 75.It Fl d 76The system is requested to create a crash dump. 77This option is 78supported only when rebooting, and it has no effect unless a dump 79device has previously been specified with 80.Xr dumpon 8 . 81.It Fl k Ar kernel 82Boot the specified 83.Ar kernel 84on the next system boot. 85If the kernel boots successfully, the 86.Em default 87kernel will be booted on successive boots, this is a one-shot option. 88If the boot fails, the system will continue attempting to boot 89.Ar kernel 90until the boot process is interrupted and a valid kernel booted. 91This may change in the future. 92.It Fl l 93The halt or reboot is 94.Em not 95logged to the system log. 96This option is intended for applications such as 97.Xr shutdown 8 , 98that call 99.Nm 100or 101.Nm halt 102and log this themselves. 103.It Fl n 104The file system cache is not flushed. 105This option should probably not be used. 106.It Fl q 107The system is halted or restarted quickly and ungracefully, and only 108the flushing of the file system cache is performed (if the 109.Fl n 110is not specified). 111This option should probably not be used. 112.It Fl p 113The system will turn off the power 114if it can. 115This is of course likely to make 116.Nm 117rather similar to 118.Nm halt . 119.El 120.Pp 121The 122.Nm fasthalt 123and 124.Nm fastboot 125utilities are nothing more than aliases for the 126.Nm halt 127and 128.Nm 129utilities. 130.Pp 131Normally, the 132.Xr shutdown 8 133utility is used when the system needs to be halted or restarted, giving 134users advance warning of their impending doom and cleanly terminating 135specific programs. 136.Sh SEE ALSO 137.Xr wtmp 5 , 138.Xr boot 8 , 139.Xr dumpon 8 , 140.Xr savecore 8 , 141.Xr shutdown 8 , 142.Xr sync 8 143.Sh HISTORY 144A 145.Nm 146command appeared in 147.At v6 . 148