dmesg -- print or control the kernel ring buffer


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


dmesg examines or controls the kernel ring buffer.

Standard Options


clears the ring buffer contents after printing.

-n level

sets the level at which logging of messages is done to the console.

-s bufsize

uses a buffer of bufsize to query the kernel ring buffer. This is 8196 by default (this matches the default kernel syslog buffer size in 2.0.33 and 2.1.103). If you have set the kernel buffer to larger than the default then this option can be used to view the entire buffer.