1.\" $OpenBSD: reboot.8,v 1.51 2024/12/21 05:01:25 jsg Exp $ 2.\" $NetBSD: reboot.8,v 1.3 1995/10/05 05:36:21 mycroft Exp $ 3.\" 4.\" Copyright (c) 1990, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)reboot.8 8.1 (Berkeley) 6/9/93 32.\" 33.Dd $Mdocdate: December 21 2024 $ 34.Dt REBOOT 8 35.Os 36.Sh NAME 37.Nm reboot , 38.Nm halt 39.Nd stopping and restarting the system 40.Sh SYNOPSIS 41.Nm halt 42.Op Fl dnpq 43.Nm reboot 44.Op Fl dnq 45.Sh DESCRIPTION 46The 47.Nm halt 48and 49.Nm reboot 50utilities flush the file system cache to disk, execute the 51.Xr rc.d 8 52scripts specified by the 53.Va pkg_scripts 54variable defined in 55.Xr rc.conf 8 56in a reverse order, 57run the system shutdown script, send all running processes a 58.Dv SIGTERM 59.Pq and subsequently a Dv SIGKILL , 60and, respectively, halt or restart the system. 61The action is logged, including entering a shutdown record into the login 62accounting file. 63.Pp 64The options are as follows: 65.Bl -tag -width Ds 66.It Fl d 67Causes system to create a dump before rebooting. 68This option is useful for debugging system dump procedures or 69capturing the state of a corrupted or misbehaving system. 70See 71.Xr savecore 8 72for information on how to recover this dump. 73.It Fl n 74Prevent file system cache from being flushed. 75This option should probably not be used. 76.It Fl p 77Causes the system to power down, if it is being halted, and the 78hardware supports automatic power down. 79.It Fl q 80Quick. 81The system is halted or restarted quickly and ungracefully, and only 82the flushing of the file system cache is performed. 83This option should probably not be used. 84.El 85.Pp 86Normally, the 87.Xr shutdown 8 88utility is used when the system needs to be halted or restarted, giving 89users advance warning of their impending doom. 90.Sh SEE ALSO 91.Xr reboot 2 , 92.Xr utmp 5 , 93.\" .Xr boot 8 , 94.Xr boot_alpha 8 , 95.Xr boot_amd64 8 , 96.Xr boot_hppa 8 , 97.Xr boot_i386 8 , 98.Xr boot_luna88k 8 , 99.Xr boot_macppc 8 , 100.Xr boot_sparc64 8 , 101.Xr rc.d 8 , 102.Xr rc.shutdown 8 , 103.Xr savecore 8 , 104.Xr shutdown 8 , 105.Xr sync 8 106.Sh HISTORY 107A 108.Nm reboot 109command appeared in 110.Bx 4.0 . 111