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.\" $FreeBSD$ 34.\" 35.Dd June 9, 1993 36.Dt REBOOT 8 37.Os 38.Sh NAME 39.Nm reboot , 40.Nm halt , 41.Nm fastboot , 42.Nm fasthalt 43.Nd stopping and restarting the system 44.Sh SYNOPSIS 45.Nm halt 46.Op Fl nqp 47.Nm 48.Op Fl dnqp 49.Nm fasthalt 50.Op Fl nqp 51.Nm fastboot 52.Op Fl dnqp 53.Sh DESCRIPTION 54The 55.Nm halt 56and 57.Nm 58utilities flush the file system cache to disk, send all running processes 59a 60.Dv SIGTERM 61(and subsequently a 62.Dv SIGKILL ) 63and, respectively, halt or restart the system. 64The action is logged, including entering a shutdown record into the 65.Xr wtmp 5 66file. 67.Pp 68The options are as follows: 69.Bl -tag -width indent 70.It Fl d 71The system is requested to create a crash dump. This option is 72supported only when rebooting, and it has no effect unless a dump 73device has previously been specified with 74.Xr dumpon 8 . 75.It Fl n 76The file system cache is not flushed. 77This option should probably not be used. 78.It Fl q 79The system is halted or restarted quickly and ungracefully, and only 80the flushing of the file system cache is performed (if the 81.Fl n 82is not specified). 83This option should probably not be used. 84.It Fl p 85The system will turn off the power 86if it can. 87This is of course likely to make 88.Nm 89rather similar to 90.Nm halt . 91.El 92.Pp 93The 94.Nm fasthalt 95and 96.Nm fastboot 97utilities are nothing more than aliases for the 98.Nm halt 99and 100.Nm 101utilities. 102.Pp 103Normally, the 104.Xr shutdown 8 105utility is used when the system needs to be halted or restarted, giving 106users advance warning of their impending doom and cleanly terminating 107specific programs. 108.Sh SEE ALSO 109.Xr wtmp 5 , 110.Xr boot 8 , 111.Xr dumpon 8 , 112.Xr savecore 8 , 113.Xr shutdown 8 , 114.Xr sync 8 115.Sh HISTORY 116A 117.Nm 118command appeared in 119.At v6 . 120