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 lnqp 47.Op Fl k Ar kernel 48.Nm 49.Op Fl dlnqp 50.Op Fl k Ar kernel 51.Nm fasthalt 52.Op Fl lnqp 53.Op Fl k Ar kernel 54.Nm fastboot 55.Op Fl dlnqp 56.Op Fl k Ar kernel 57.Sh DESCRIPTION 58The 59.Nm halt 60and 61.Nm 62utilities flush the file system cache to disk, send all running processes 63a 64.Dv SIGTERM 65(and subsequently a 66.Dv SIGKILL ) 67and, respectively, halt or restart the system. 68The action is logged, including entering a shutdown record into the 69.Xr wtmp 5 70file. 71.Pp 72The options are as follows: 73.Bl -tag -width indent 74.It Fl d 75The system is requested to create a crash dump. 76This option is 77supported only when rebooting, and it has no effect unless a dump 78device has previously been specified with 79.Xr dumpon 8 . 80.It Fl k Ar kernel 81Boot the specified 82.Ar kernel 83on the next system boot. 84If the kernel boots successfully, the 85.Em default 86kernel will be booted on successive boots, this is a one-shot option. 87If the boot fails, the system will continue attempting to boot 88.Ar kernel 89until the boot process is interrupted and a valid kernel booted. 90This may change in the future. 91.It Fl l 92The halt or reboot is 93.Em not 94logged to the system log. 95This option is intended for applications such as 96.Xr shutdown 8 , 97that call 98.Nm 99or 100.Nm halt 101and log this themselves. 102.It Fl n 103The file system cache is not flushed. 104This option should probably not be used. 105.It Fl q 106The system is halted or restarted quickly and ungracefully, and only 107the flushing of the file system cache is performed (if the 108.Fl n 109option is not specified). 110This option should probably not be used. 111.It Fl p 112The system will turn off the power if it can. 113If the power down action fails, the system 114will halt or reboot normally, depending on whether 115.Nm halt 116or 117.Nm 118was called. 119.El 120.Pp 121The 122.Nm fasthalt 123and 124.Nm fastboot 125utilities are nothing more than aliases for the 126.Nm halt 127and 128.Nm 129utilities. 130.Pp 131Normally, the 132.Xr shutdown 8 133utility is used when the system needs to be halted or restarted, giving 134users advance warning of their impending doom and cleanly terminating 135specific programs. 136.Sh SEE ALSO 137.Xr wtmp 5 , 138.Xr boot 8 , 139.Xr dumpon 8 , 140.Xr savecore 8 , 141.Xr shutdown 8 , 142.Xr sync 8 143.Sh HISTORY 144A 145.Nm 146utility appeared in 147.At v6 . 148