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Update cheatsheets
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@@ -6,6 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
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# journalctl
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> Query the systemd journal.
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> See also: `dmesg`.
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> More information: <https://www.freedesktop.org/software/systemd/man/journalctl.html>.
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- Show all messages with priority level 3 (errors) from this boot:
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