1.\" $NetBSD: dmesg.8,v 1.16 2004/04/30 16:11:03 wiz Exp $ 2.\" 3.\" Copyright (c) 1980, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)dmesg.8 8.1 (Berkeley) 6/5/93 31.\" 32.Dd April 30, 2004 33.Dt DMESG 8 34.Os 35.Sh NAME 36.Nm dmesg 37.Nd "display the system message buffer" 38.Sh SYNOPSIS 39.Nm 40.Op Fl M Ar core 41.Op Fl N Ar system 42.Sh DESCRIPTION 43.Nm 44displays the contents of the system message buffer. 45.Pp 46The options are as follows: 47.Bl -tag -width Ds 48.It Fl M 49Extract values associated with the name list from the specified core 50instead of the default ``/dev/mem''. 51.It Fl N 52Extract the name list from the specified system instead of the default 53``/netbsd''. 54.El 55.Pp 56The system message buffer is a circular buffer of a fixed size. 57If the buffer has been filled, the first line of the 58.Nm 59output may not be complete. 60The size of the message buffer is configurable at compile-time on 61most systems with the 62.Dv MSGBUFSIZE 63kernel option. 64Look for 65.Dv MSGBUFSIZE 66in 67.Xr options 4 68for details. 69.Sh FILES 70.Bl -tag -width /var/run/dmesg.boot -compact 71.It Pa /var/run/dmesg.boot 72copy of dmesg at the time of last boot. 73.El 74.Sh SEE ALSO 75.Xr options 4 , 76.Xr syslogd 8 77.Sh HISTORY 78The 79.Nm 80command appeared in 81.Bx 4.0 . 82