101-500 Exam Dumps | Which command reads and displays the current contents of the Kernel Ring Buffer on the command line?

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LPIC-1 Exam 101, Part 1 of 2, version 5.0
Lpi.101-500.v2024-01-22.q115
Question 87

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Question 87/115

Which command reads and displays the current contents of the Kernel Ring Buffer on the command line?
(Specify ONLY the command without any path or parameters.)

Correct Answer:

dmesg
Explanation
The dmesg command is used to print or control the kernel ring buffer. The kernel ring buffer is a special kind of buffer that stores the messages generated by the kernel, such as the boot messages, the hardware errors, the driver information, etc. The kernel ring buffer is a fixed-size circular buffer, which means that when it is full, the oldest messages are overwritten by the new ones. The dmesg command can show the messages in the kernel ring buffer, as well as filter, save, or clear them. The syntax of the dmesg command is:
dmesg [options]
The options are optional, and they can modify the behavior of the dmesg command, such as changing the output format, the timestamp, the level, the facility, the color, etc. For more information, see the dmesg man page1 or the Linuxize tutorial2.

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