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RedHat 9 (Linux i386) - man page for dmesg (redhat section 8)

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

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 mes-
       sages by hand, the user need only:
	      dmesg > boot.messages
       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)

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

											 DMESG(8)


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