journalctl
Query the systemd journal. More information: https://manned.org/journalctl.
- Show all messages with priority level 3 (errors) from this [b]oot:
journalctl -b --priority={{3}}
- Show all messages from last [b]oot:
journalctl -b -1
- Delete journal logs which are older than 2 days:
journalctl --vacuum-time={{2d}}
- [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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