Showing logs from the previous boot | LPIC-1 101-500 Exam original practice question

101.2Standard

After a reboot, investigate a failure from the immediately preceding boot.

Persistent journal storage contains previous boot IDs.

Which command is appropriate?

Hint 1: Focus on the requirement

Identify what must change and what must remain unchanged. Then choose the command whose scope matches that requirement.

Hint 2: Check each command's role

Separate commands that display information, change state, remove data, or affect a child process.

journalctl -b 1: Incorrect. -b 1 is not the relative previous-boot selector used here.
journalctl -b -1: Correct. -b -1 selects the immediately previous boot.
journalctl -b 0 -f: Incorrect. -b 0 -f follows the current boot.
journalctl --rotate: Incorrect. --rotate rotates journal files and does not select a boot.

Detailed explanation

Incorrectjournalctl -b 1

Incorrect. -b 1 is not the relative previous-boot selector used here.

Correctjournalctl -b -1

Correct. -b -1 selects the immediately previous boot.

Incorrectjournalctl -b 0 -f

Incorrect. -b 0 -f follows the current boot.

Incorrectjournalctl --rotate

Incorrect. --rotate rotates journal files and does not select a boot.

An example you can run in a temporary verification environment.

journalctl --list-boots --no-pager 2>/dev/null | tail || echo 'persistent boot journal is unavailable'

保存済み起動のオフセットとboot ID、または未利用の表示

Foundation review

Check whether the command acts on the current shell, a new process, an existing process, or a file.

Use the supplied command and compare the output with the expected result.

Question IDKP-101-150

EnvironmentLinux / systemd journal 255以降

Last technical review2026-08-12