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Journal

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Reference:wiki.archlinux.org

Usage

shell

journalctl OPTIONS

Option	Description
`-b` `--boot`	Show messages from a specific boot. Defaults to current boot.
`-S` `--since`	Show messages from date.
`-U` `--until`	Show messages until date.
`-u` `--unit`	Show messages for the specified systemd unit.
`-k` `--dmesg`	Show only kernel messages. This implies `-b`.
`-p` `--priority`	Filter output by message priorities or priority ranges.

Priority levels are: emerg (0), alert (1), crit (2), err (3), warning (4), notice (5), info (6), debug (7).

Show messages from the previous boot.

shell

journalctl -b -1

Show messages between a specified time frame.

shell

journalctl --since "2021-07-17 10:00:00" --until "2021-07-17 22:00:00"

Show messages by a specific systemd unit.

shell

journalctl -u man-db.service

Show only error or more important logs.

shell

journalctl -p err