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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)reboot.8 8.1 (Berkeley) 6/9/93 29.\" $FreeBSD: src/sbin/reboot/reboot.8,v 1.10.2.7 2003/02/23 22:42:10 trhodes Exp $ 30.\" 31.Dd November 1, 2019 32.Dt REBOOT 8 33.Os 34.Sh NAME 35.Nm reboot , 36.Nm halt , 37.Nm fastboot , 38.Nm fasthalt 39.Nd stopping and restarting the system 40.Sh SYNOPSIS 41.Nm halt 42.Op Fl lnqp 43.Nm 44.Op Fl dlnqp 45.Nm fasthalt 46.Op Fl lnqp 47.Nm fastboot 48.Op Fl dlnqp 49.Sh DESCRIPTION 50The 51.Nm halt 52and 53.Nm 54utilities flush the file system cache to disk, send all running processes 55a 56.Dv SIGTERM 57(and subsequently a 58.Dv SIGKILL ) 59and, respectively, halt or restart the system. 60The action is logged, including entering a shutdown record into the 61.Xr wtmpx 5 62file. 63.Pp 64The options are as follows: 65.Bl -tag -width indent 66.It Fl d 67The system is requested to create a crash dump. 68This option is 69supported only when rebooting, and it has no effect unless a dump 70device has previously been specified with 71.Xr dumpon 8 . 72.It Fl l 73The halt or reboot is 74.Em not 75logged to the system log. 76This option is intended for applications such as 77.Xr shutdown 8 , 78that call 79.Nm 80or 81.Nm halt 82and log this themselves. 83.It Fl n 84The file system cache is not flushed. 85This option should probably not be used. 86.It Fl q 87The system is halted or restarted quickly and ungracefully, and only 88the flushing of the file system cache is performed (if the 89.Fl n 90is not specified). 91This option should probably not be used. 92.It Fl p 93The system will turn off the power 94if it can. 95This is of course likely to make 96.Nm 97rather similar to 98.Nm halt . 99.El 100.Pp 101The 102.Nm fasthalt 103and 104.Nm fastboot 105utilities are nothing more than aliases for the 106.Nm halt 107and 108.Nm 109utilities. 110.Pp 111Normally, the 112.Xr shutdown 8 113utility is used when the system needs to be halted or restarted, giving 114users advance warning of their impending doom and cleanly terminating 115specific programs. 116.Sh SEE ALSO 117.Xr wtmpx 5 , 118.Xr boot 8 , 119.Xr dumpon 8 , 120.Xr savecore 8 , 121.Xr shutdown 8 , 122.Xr sync 8 123.Sh HISTORY 124A 125.Nm 126command appeared in 127.Bx 4.0 . 128