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.\" $Id$ 34.\" 35.Dd June 9, 1993 36.Dt REBOOT 8 37.Os 38.Sh NAME 39.Nm reboot , 40.Nm halt 41.Nd 42stopping and restarting the system 43.Sh SYNOPSIS 44.Nm halt 45.Op Fl nqp 46.Nm reboot 47.Op Fl nqp 48.Nm fasthalt 49.Op Fl nqp 50.Nm fastboot 51.Op Fl nqp 52.Sh DESCRIPTION 53The 54.Nm halt 55and 56.Nm 57utilities flush the file system cache to disk, send all running processes 58a SIGTERM (and subsequently a SIGKILL) and, respectively, halt or restart 59the system. 60The action is logged, including entering a shutdown record into the login 61accounting file. 62.Pp 63The options are as follows: 64.Bl -tag -width indent 65.It Fl n 66The file system cache is not flushed. 67This option should probably not be used. 68.It Fl q 69The system is halted or restarted quickly and ungracefully, and only 70the flushing of the file system cache is performed. 71This option should probably not be used. 72.It Fl p 73The system will turn off the power 74if it can. This is of course likely to make 75.Nm 76rather similar to 77.Nm halt . 78.El 79.Pp 80The 81.Nm fasthalt 82and 83.Nm fastboot 84utilities are nothing more than aliases for the 85.Nm halt 86and 87.Nm 88utilities. 89.Pp 90Normally, the 91.Xr shutdown 8 92utility is used when the system needs to be halted or restarted, giving 93users advance warning of their impending doom. 94.Sh SEE ALSO 95.Xr utmp 5 , 96.Xr boot 8 , 97.Xr shutdown 8 , 98.Xr sync 8 99.Sh HISTORY 100A 101.Nm 102command appeared in 103.At v6 . 104