Shulou(Shulou.com)06/02 Report--

Today, the editor shares with you the use of linux's dmesg command to display boot information. I believe many people do not know much about it. In order to make you understand better, I have summarized the following contents for you. Let's look down together. I'm sure you'll get something.

The dmesg command is used to check and control the kernel's ring buffer. Kernel stores boot information in ring buffer. If you don't have time to check the information when you power on, you can use dmesg to check it. Boot information is saved in the / var/log/dmesg file.

Syntax format: dmesg [parameters]

Common parameters:

-c after displaying the information, clear the content in ring buffer-s preset to 8196, which is exactly equal to the size of ring buffer-n sets the level of recording information.

Reference example

Search for keywords for boot information:

[root@linuxcool ~] # dmesg | grep sda

Ignore case search keywords:

[root@linuxcool ~] # dmesg | grep-I memory

The first 20 lines of the boot message are displayed:

[root@linuxcool ~] # dmesg | head-20

The last 20 lines of the boot message are displayed:

[root@linuxcool ~] # dmesg | tail-20

Clear the logs in the dmesg ring buffer:

[root@linuxcool] # dmesg-c on using the dmesg command of linux to display boot information is shared here. I hope the above content can be used as a reference for everyone. If you like this article, you might as well share it for more people to see.

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