Type the journalctl invocation that shows only kernel messages — the journal's equivalent of dmesg (do not include a path).
LPIC-1 Exam 102-500, objective 108. Essential system services easy
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Answer
Type the answer.
Accepted answers
journalctl -kjournalctl --dmesg
Case sensitive — Linux is, and grading LS as ls would teach a falsehood.
Why
-k, the long form of which is --dmesg, restricts output to entries generated by the kernel, that is those with _TRANSPORT=kernel. Unlike dmesg it is not limited to the kernel ring buffer, so with a persistent journal it can be combined with -b -1 to read the kernel messages of an earlier boot. It composes with the other filters, for example `journalctl -k -p err -b`.
Where this comes from
- Cited
- manual page journalctl(1)
Practise this
Reading one question is not practice. The trainer will draw a short set from objective 108 and space the ones you get wrong.
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