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.\" 34.Dd June 9, 1993 35.Dt REBOOT 8 36.Os 37.Sh NAME 38.Nm reboot , 39.Nm halt 40.Nd 41stopping and restarting the system 42.Sh SYNOPSIS 43.Nm halt 44.Op Fl nq 45.Nm reboot 46.Op Fl nq 47.Sh DESCRIPTION 48The 49.Nm halt 50and 51.Nm reboot 52utilities flush the file system cache to disk, send all running processes 53a SIGTERM (and subsequently a SIGKILL) and, respectively, halt or restart 54the system. 55The action is logged, including entering a shutdown record into the login 56accounting file. 57.Pp 58The options are as follows: 59.Bl -tag -width Ds 60.It Fl n 61If the 62.Fl n 63option is specified, 64the file system cache is not flushed. 65This option should probably not be used. 66.It Fl q 67If the 68.Fl q 69option is specified, 70the system is halted or restarted quickly and ungracefully, and only 71the flushing of the file system cache is performed. 72This option should probably not be used. 73.El 74.Pp 75Normally, the 76.Xr shutdown 8 77utility is used when the system needs to be halted or restarted, giving 78users advance warning of their impending doom. 79.Sh SEE ALSO 80.Xr sync 1 , 81.Xr utmp 5 , 82.Xr boot 8 , 83.Xr shutdown 8 84.Sh HISTORY 85A 86.Nm reboot 87command appeared in 88.At v6 . 89