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wiki/notebook/cli.journalctl.org
Gabriel Arazas b088086b06 Merge evergreen notes into the notebook 
Now, it's all under the notebook umbrella. Seems to be appropriate as it
is just my notes after all.

I also updated some notes from there. I didn't keep track of what it is
this time. Something about more learning notes extracted from my
"Learning how to learn" course notes and then some. Lack of time and
hurriness just makes it difficult to track but it should be under
version control already.
2021-07-21 16:28:07 +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.