Journalctl

Internal

• systemd

Overview

journalctl may be used to query the contents of the systemd journal as written by systemd-journald.service.

If called without parameters, it will show the full contents of the journal, starting with the oldest entry collected.

-u (unit)

-u, --unit=

Show messages for the specified systemd unit. This will add a match for messages from the unit ("_SYSTEMD_UNIT=") and additional matches for messages from systemd and messages about coredumps for the specified unit. This parameter can be specified multiple times.

-r (reverse)

-r, --reverse

Reverse output, so the newest entries are displayed first.