Copyright (c) 1980, 1991, 1993
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)dmesg.8 8.1 (Berkeley) 6/5/93
$FreeBSD$
.Dd May 9, 2013 .Dt DMESG 8 .Os .Sh NAME .Nm dmesg .Nd "display the system message buffer" .Sh SYNOPSIS .Nm .Op Fl ac .Op Fl M Ar core Op Fl N Ar system .Sh DESCRIPTION The .Nm utility displays the contents of the system message buffer. If the .Fl M option is not specified, the buffer is read from the currently running kernel via the .Xr sysctl 3 interface. Otherwise, the buffer is read from the specified core file, using the name list from the specified kernel image (or from the default image).
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)dmesg.8 8.1 (Berkeley) 6/5/93
$FreeBSD$
.Dd May 9, 2013 .Dt DMESG 8 .Os .Sh NAME .Nm dmesg .Nd "display the system message buffer" .Sh SYNOPSIS .Nm .Op Fl ac .Op Fl M Ar core Op Fl N Ar system .Sh DESCRIPTION The .Nm utility displays the contents of the system message buffer. If the .Fl M option is not specified, the buffer is read from the currently running kernel via the .Xr sysctl 3 interface. Otherwise, the buffer is read from the specified core file, using the name list from the specified kernel image (or from the default image).
p The options are as follows: l -tag -width indent t Fl a Show all data in the message buffer. This includes any syslog records and
a /dev/console output. t Fl c Clear the kernel buffer after printing. t Fl M Extract values associated with the name list from the specified core. t Fl N If .Fl M is also specified, extract the name list from the specified system instead of the default, which is the kernel image the system has booted from. .El .Sh FILES l -tag -width ".Pa /var/run/dmesg.boot" -compact t Pa /var/run/dmesg.boot usually a snapshot of the buffer contents taken soon after file systems are mounted at startup time .El .Sh SEE ALSO .Xr sysctl 3 , .Xr syslogd 8 .Sh HISTORY The .Nm utility appeared in x 4.0 .