Display entries from 2026-08-13 09:00:00 onward.
Which command is appropriate?
--since sets the start boundary; --until sets the end boundary.
Detailed explanation
journalctl --until '2026-08-13 09:00:00'Incorrect. --until sets an upper time boundary.
Incorrect. --until sets an upper time boundary.
journalctl --since '2026-08-13 09:00:00'Correct. --since starts the displayed time range.
Correct. --since starts the displayed time range.
journalctl --boot '2026-08-13 09:00:00'Incorrect. --boot filters by boot ID or offset.
Incorrect. --boot filters by boot ID or offset.
journalctl --vacuum-time '2026-08-13 09:00:00'Incorrect. --vacuum-time deletes old journal data rather than filtering output.
Incorrect. --vacuum-time deletes old journal data rather than filtering output.
Try it yourself
An example you can run in a temporary verification environment.
journalctl --help 2>&1 | grep -E -- '--since|--until' | head -n 2Expected result
--sinceと--untilのhelp行Key points
- since is start
- until is end
- Vacuum is deletion
Notes
- Environment: journalctl helpの読取のみ
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.