dmesg man page on aLinux

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DMESG(1)							      DMESG(1)

       dmesg - print or control the kernel ring buffer

       dmesg [-c] [-r] [-n level] [-s bufsize]

       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 > boot.messages
       and mail the boot.messages file to whoever can debug their problem.

       -c     Clear the ring buffer contents after printing.

       -r     Print the raw message buffer, i.e., don't strip  the  log	 level

       -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 con‐
	      sole.  For example, -n 1 prevents	 all  messages,	 except	 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

	      When  both options are used, only the last option on the command
	      line will have an effect.


       The dmesg command is part of the util-linux-ng package and is available


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