The dmesg command allows you to view messages from the kernel ring buffer. These messages can be useful for troubleshooting issues with the kernel, drivers, or other system components.
To use dmesg, simply type the command followed by any options or arguments you want to use. Some common options include:
-c: Clear the kernel ring buffer after reading it.
-f: Follow the kernel ring buffer in real-time, similar to the tail -f command.
-T: Display timestamps for each message.
-n: Set the minimum log level to display. For example, -n 4 will only show messages with a log level of 4 or higher.
For example, to view the most recent kernel messages and follow the kernel ring buffer in real-time, you would use the following command:
dmesg -f
You can also use dmesg to send a message to the kernel ring buffer. To do this, use the -s option followed by the message you want to send. For example:
dmesg -s "Hello, kernel!"
This can be useful for debugging or testing purposes.
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