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Quick links About dmesg
Syntax
Examples
Related commands
Linux / Unix main page
About dmesg
Print or control the kernel ring buffer. The program helps users to print out their bootup
messages. Instead of copying the messages by hand and mail the
boot.messages file to whoever can debug their problem.
Syntax
dmesg [ -c ] [ -n level ] [ -s bufsize ]
| -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. |
Examples
dmesg
Display the kernel ring buffer to the screen.
dmesg > boot.messages
Send the kernel ring buffer to the boot.messages
file, which could then be sent to another person.
Related commands
sysinfo
sysklogd
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