journalctl

Query the systemd journal.

• Show all messages from this [b]oot:

journalctl -b

• Show all messages from last [b]oot:

journalctl -b -1

• Show all messages with priority level 3 (errors) from this [b]oot:

journalctl -b --priority={3}

• [f]ollow new messages (like `tail -f` for traditional syslog):

journalctl -f

• Show all messages by a specific [u]nit:

journalctl -u {unit}

• Filter messages within a time range (either timestamp or placeholders like "yesterday"):

journalctl --since {now|today|yesterday|tomorrow} --until {YYYY-MM-DD HH:MM:SS}

• Show all messages by a specific process:

journalctl _PID={pid}

• Show all messages by a specific executable:

journalctl {path/to/executable}

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