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 nqp 45.Nm reboot 46.Op Fl nqp 47.Nm fasthalt 48.Op Fl nqp 49.Nm fastboot 50.Op Fl nqp 51.Sh DESCRIPTION 52The 53.Nm halt 54and 55.Nm reboot 56utilities flush the file system cache to disk, send all running processes 57a SIGTERM (and subsequently a SIGKILL) and, respectively, halt or restart 58the 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 n 65If the 66.Fl n 67option is specified, 68the file system cache is not flushed. 69This option should probably not be used. 70.It Fl q 71If the 72.Fl q 73option is specified, 74the system is halted or restarted quickly and ungracefully, and only 75the flushing of the file system cache is performed. 76This option should probably not be used. 77.It Fl p 78If the 79.Fl p 80option is specified, then the system will turn off the power 81if it can. This is of course likely to make 82.Nm reboot 83rather similar to 84.Nm halt. 85.El 86.Pp 87The 88.Nm fasthalt 89and 90.Nm fastboot 91utilities are nothing more than aliases for the 92.Nm halt 93and 94.Nm reboot 95utilities. 96.Pp 97Normally, the 98.Xr shutdown 8 99utility is used when the system needs to be halted or restarted, giving 100users advance warning of their impending doom. 101.Sh SEE ALSO 102.Xr utmp 5 , 103.Xr boot 8 , 104.Xr shutdown 8 , 105.Xr sync 8 106.Sh HISTORY 107A 108.Nm reboot 109command appeared in 110.At v6 . 111