DMESG Display Boot Information command

DMESG Display Boot Information

Kernel will store the boot information in the ring buffer, if the boot time is too late to see, you can use the Dmeg view.

Path/VAR/LOG/DMESG

Common parameters:

-C After displaying the information, clear the contents of the ring buffer

-s< buffer size > Preset value is 8196, just equal to ring buffer size

-N Set the level of logging information

Instance:

1-Send a boot message

Man Dmesg wrote
The program helps users and 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.

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[ email protected] ~]#mail-s "boot log of Linux server mysql01-new" [email protected]

2-Browse DMESG output information

Uname-a Viewing system version information

DMESG |less

Less/var/log/dmesg

Tail/var/log/dmesg

3-View serial information, network card information

grep ttys*/VAR/LOG/DMESG

Or: Dmes |grep ttys*

DMESG |grep-n ' em1 '

4-Print and clear the kernel information buffer

Dmesg-c

DMESG Display Boot Information command