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wiki/notebook/cli.journalctl.org
Gabriel Arazas ed1c78669e Update notebook as of 2021-08-27 
I forgot. I should process more notes starting tomorrow. ;p
2021-08-27 22:24:00 +08:00

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Command line: journalctl

The logging daemon of systemd (see systemd-journald). Not only it can view your logs, you can ask to view specific logs and delete some of them.

For more information, see journalctl.1 manual page.

Options

  • -b, --boot - show the logs starting from boot time
  • -e, --pager-end - go to the end of the logs
  • -f, --follow - watch the logs
  • --user-unit - show logs from a user unit
  • -u, --unit [UNIT] - show the logs of a system unit
  • --vacuum-time [TIMESPAN] - delete logs older than the specified timespan 1
  • -x, --catalog - prints helpful messages such as the documentation URIs

Examples

This tool is already comprehensive. Needs a comprehensive database of examples to fight against this scope.

Watch the logs from a specific unit at boot time 

journalctl --user-unit borgbackup.service -fb

Delete the logs older than a month 

journalctl --vacuum-time=1m

View the latest logs with helpful messages 

journalctl -xe
1

View systemd.time.5 for more information.