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Full Discussion: dmesg freebsd
Top Forums UNIX for Dummies Questions & Answers dmesg freebsd Post 30814 by Perderabo on Monday 28th of October 2002 09:59:58 AM
Old 10-28-2002
I've been looking over a freebsd system that we have. It doesn't look like there's any way to clear the message buffer via sysctl, even if you invoke sysctl from c. You could bypass sysctl and clear it out, but it looks like /etc/periodic/security/700.kernelmsg is expecting you to not do this. And it should be maintaining /var/log/dmesg.today for you.

The leading lines in dmesg should not be preventing you from reading the last lines in dmesg. When you run "dmesg" just look at the trailing lines. If you really can't do that, try "dmesg | tail".

To make the lines go away, you need to start thinking about where they come from. The trick is to make them not appear in the first place. Since the lines appear on one system and not the other, the two systems are not identical. Compare them and figure out what is different.

They look like boot up debugging info of some kind. So I would start with the /boot/loader files and continue with anything involved in getting the kernel into core.
 

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LEARN ABOUT FREEBSD

dmesg

DMESG(8)						    BSD System Manager's Manual 						  DMESG(8)

NAME

     dmesg -- display the system message buffer

SYNOPSIS

     dmesg [-ac] [-M core [-N system]]

DESCRIPTION

     The dmesg utility displays the contents of the system message buffer.  If the -M option is not specified, the buffer is read from the cur-
     rently running kernel via the 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 options are as follows:

     -a      Show all data in the message buffer.  This includes any syslog records and /dev/console output.

     -c      Clear the kernel buffer after printing.

     -M      Extract values associated with the name list from the specified core.

     -N      If -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.

FILES

     /var/run/dmesg.boot  usually a snapshot of the buffer contents taken soon after file systems are mounted at startup time

SEE ALSO

     sysctl(3), syslogd(8)

HISTORY

     The dmesg utility appeared in 4.0BSD.

BSD
								    May 9, 2013 							       BSD
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