1.\" $OpenBSD: dmesg.8,v 1.13 2011/07/31 13:26:43 schwarze Exp $ 2.\" $NetBSD: dmesg.8,v 1.9 1995/03/18 14:54:47 cgd Exp $ 3.\" 4.\" Copyright (c) 1980, 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.\" @(#)dmesg.8 8.1 (Berkeley) 6/5/93 32.\" 33.Dd $Mdocdate: July 31 2011 $ 34.Dt DMESG 8 35.Os 36.Sh NAME 37.Nm dmesg 38.Nd "display the system message buffer" 39.Sh SYNOPSIS 40.Nm dmesg 41.Op Fl M Ar core 42.Op Fl N Ar system 43.Sh DESCRIPTION 44.Nm 45displays the contents of the system message buffer. 46It is most commonly used to review system startup messages. 47.Pp 48The options are as follows: 49.Bl -tag -width Ds 50.It Fl M Ar core 51Extract values associated with the name list from the specified 52.Ar core 53instead of the default 54.Pa /dev/kmem . 55.It Fl N Ar system 56Extract the name list from the specified 57.Ar system 58instead of the default 59.Pa /bsd . 60.El 61.Sh FILES 62.Bl -tag -width /var/run/dmesg.boot -compact 63.It Pa /var/run/dmesg.boot 64copy of 65.Nm 66saved by 67.Xr rc 8 68at boot time 69.El 70.Sh SEE ALSO 71.Xr syslogd 8 72.Sh HISTORY 73The 74.Nm 75command appeared in 76.Bx 4.0 . 77