2014-02-25 02:13:55 +00:00
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# journalctl
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2016-01-07 17:31:27 +00:00
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> Query the systemd journal.
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2021-09-02 19:33:49 +01:00
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> More information: <https://manned.org/journalctl>.
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2014-02-25 02:13:55 +00:00
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2022-06-18 21:55:44 +01:00
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- Show all messages with priority level 3 (errors) from this [b]oot:
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2014-02-25 02:13:55 +00:00
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2022-06-18 21:55:44 +01:00
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`journalctl -b --priority={{3}}`
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2014-02-25 02:13:55 +00:00
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2022-06-18 21:55:44 +01:00
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- Delete journal logs which are older than 2 days:
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2020-10-12 22:18:41 +01:00
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2022-06-18 21:55:44 +01:00
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`journalctl --vacuum-time={{2d}}`
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2020-10-12 22:18:41 +01:00
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2021-05-09 18:54:42 +01:00
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- [f]ollow new messages (like `tail -f` for traditional syslog):
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2014-02-25 02:13:55 +00:00
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`journalctl -f`
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2021-05-09 18:54:42 +01:00
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- Show all messages by a specific [u]nit:
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2014-02-25 02:13:55 +00:00
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`journalctl -u {{unit}}`
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2023-12-29 15:00:45 +00:00
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- Show logs for a given unit since the last time it started:
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`journalctl _SYSTEMD_INVOCATION_ID=$(systemctl show --value --property=InvocationID {{unit}})`
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2019-07-31 12:45:03 +01:00
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- Filter messages within a time range (either timestamp or placeholders like "yesterday"):
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2019-08-17 05:30:03 +01:00
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`journalctl --since {{now|today|yesterday|tomorrow}} --until {{YYYY-MM-DD HH:MM:SS}}`
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2019-07-31 12:45:03 +01:00
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2016-01-07 17:31:27 +00:00
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- Show all messages by a specific process:
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2014-02-25 02:13:55 +00:00
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`journalctl _PID={{pid}}`
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2016-01-07 17:31:27 +00:00
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- Show all messages by a specific executable:
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2014-02-25 02:13:55 +00:00
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2018-02-10 14:42:11 +00:00
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`journalctl {{path/to/executable}}`
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