[Solved] What will be the output of the command dmesg | grep -i error? — Ans: All kernel messages containing the word 'error' (case-insensitive) | Linux CLI

Linux CLI - System Administration

What will be the output of the command dmesg | grep -i error?

AAll kernel messages containing the word 'error' (case-insensitive)

BOnly error messages from user applications

CA syntax error due to wrong grep usage

DNo output, because dmesg does not support grep

Step-by-Step Solution

Solution:

Step 1: Understand piping dmesg to grep
Piping dmesg output to grep filters kernel messages matching the pattern.
Step 2: Analyze grep -i error
The -i flag makes grep case-insensitive, so it matches 'error' or 'Error'.
Final Answer:
All kernel messages containing the word 'error' (case-insensitive) -> Option A
Quick Check:
dmesg | grep -i error filters kernel errors [OK]

Quick Trick: Pipe dmesg to grep -i to find errors ignoring case [OK]

Common Mistakes:

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What will be the output of the command dmesg | grep -i error?