dmesg

dmesg is used to examine or control the kernel ring buffer.

• dmesg [EN] @ Wikipedia

Documentation

• man 1 'dmesg' [EN]

Syntax

dmesg [PARAMETER ...]

Parameters

-c, --read-clear

Clear the ring buffer after first printing its contents.

-d, --show-delta

Display the timestamp and the time delta spent between messages. If used together with --notime then only the time delta without the timestamp is printed.

-e, --reltime

Display the local time and the delta in human-readable format. Be aware that conversion to the local time could be inaccurate (see -T for more details).

-L [WHEN], --color[=WHEN]

Colorize the output. The optional argument WHEN can be auto, never or always. If the WHEN argument is omitted, it defaults to auto.

-n LIST, --level LIST

Restrict output to the given (comma-separated) LIST of levels. For all supported levels see the --help output.

-t, --notime

Do not print kernel's timestamps.

-T, --ctime

Print human-readable timestamps.

Examples

Show the delays during the booting

dmesg --show-delta --color='always' | less -R