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wiki/structured/cli.journalctl.org
Gabriel Arazas ae3656f006 Make the command line notes consistent 
Just the title anyways. It makes easier to find aside from the file name
and also makes it clear in case I refer to them from other documents.
2021-06-20 10:22:13 +08:00

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Command line: journalctl

The logging daemon of systemd. (Ooooh…) 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.