Name
dmesg — print or control the kernel ring buffer
Synopsis
dmesg [−c] [ −n level ] [ −s bufsize ]
DESCRIPTION
dmesg is
used to examine or control the kernel ring buffer.
The program helps users to print out their bootup
messages. Instead of copying the messages by hand, the user
need only:
and mail the boot.messages file to whoever
can debug their problem.
OPTIONS
−c-
Clear the ring buffer contents after printing.
−sbufsize-
Use a buffer of size bufsize to query the
kernel ring buffer. This is 16392 by default. (The
default kernel syslog buffer size was 4096 at first,
8192 since 1.3.54, 16384 since 2.1.113.) If you have
set the kernel buffer to be larger than the default
then this option can be used to view the entire
buffer.
−nlevel-
Set the level at which logging of
messages is done to the console. For example,
−n 1 prevents all
messages, expect panic messages, from appearing on the
console. All levels of messages are still written to
/proc/kmsg, so
syslogd(8) can still be
used to control exactly where kernel messages appear.
When the −n option is
used, dmesg will not print or clear the
kernel ring buffer.
When both options are used, only the last option on
the command line will have an effect.
SEE ALSO
syslogd(8)
Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
May be distributed under the GNU General Public License
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