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DMESG
!!!DMESG
NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
AUTHOR
----
!!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:


dmesg


and mail the ''boot.messages'' file to whoever can debug
their problem.
!!OPTIONS


__-c__


Clear the ring buffer contents after printing.


__-s__''bufsize''


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.


__-n__''level''


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)
!!AUTHOR


Theodore Ts'o (tytso@athena.mit.edu)
----

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Last edited on Tuesday, June 4, 2002 12:31:10 am by "perry"

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