Find Log In

^{Home OS}

journalctl

Filtering by date/time

• -b Show logs from the last boot.
• -b N Show logs from the n-th boot (use --list--boots to get boot index).
• --since "yyyy-mm-dd hh:MM:ss" Show logs since. Also the following keywords may be used instead of exact date/time: yesterday, today, tomorrow, or now. Alternatively, a numbered value may be used with or without - or + prefix or the keyword ago, e.g. 11 hour ago`.
• --until "yyyy-mm-dd hh:MM:ss" Show logs until. The same rules apply.

Other filtering

• -u Show logs for unit, e.g. -u postgres.service. May be provided multiple times.
• -k or --dmesg Show kernel messages.
• -p N Show logs with specific priority (e.g. err, warning, info or their numeric value).

Controlling output

• --no-pager
• -n or -n N Same as tail
• -f Follow logs as they appear.

Housekeeping

• --disk-usage
• --vacuum-size=N Truncate logs up to size N (e.g. 1G).
• --vacuum-time=T Truncate logs up to T (e.g. 1years will delete entries that are older than a year).

Examples

Show last boot errors:

journalctl -b -1 -e