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wiki/notebook/cli.journalctl.org
Gabriel Arazas 732ef34ca8 Update notebook as of 2021-10-09 
Welp, I rarely take notes nowadays due to more specialized work and
stuff. Though, I should have more incentives for writing. In other
words, I'm just lazy. ;p

More free-thinking morning sessions should be done soon.
2021-10-09 18:14:46 +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 [ID][+OFFSET] shows the logs starting from given boot time (or current boot if empty).
  • -e, --pager-end to go to the end of the logs.
  • -f, --follow watches the logs.
  • -k, --dmesg prints the logs from the kernel.
  • --list-boots prints a list of boots useful for knowing the boot logs from -b.
  • --user-unit shows logs from a user unit.
  • -u, --unit [UNIT] shows the logs of a system unit.
  • --vacuum-time [TIMESPAN] deletes 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

Get the logs of a service unit from 2 boots ago 

journalctl --boot -2 --user-unit borgbackup@personal-drive.service
1

View systemd.time.5 for more information.