dmesg - phpMan

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DMESG(1)                                                              DMESG(1)



NAME
       dmesg - print or control the kernel ring buffer

SYNOPSIS
       dmesg [-c] [-r] [-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 > boot.messages
       and mail the boot.messages file to whoever can debug their problem.

OPTIONS
       -c     Clear the ring buffer contents after printing.

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

       -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, 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  ker-
              nel ring buffer.

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

SEE ALSO
       syslogd(8)

AVAILABILITY
       The dmesg command is part of  the  util-linux-ng  package  and  is  available  from
       ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.



                                                                      DMESG(1)

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