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I have one systemd service which runs with systemctl --user start test_unit@random_arguments. How could I use journalctl to filter all logs of test_unit? If it supports "follow mode", that's even better.

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If this is a user unit, use the --user-unit option:

journalctl -f --user-unit=test_unit@random_arguments

Otherwise, filter the unit with _SYSTEMD_UNIT:

sudo journalctl -f _SYSTEMD_UNIT=test_unit@random_arguments
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  • Thanks. The --user option saves my day. journalctl --user -u test_unit@* -f works
    – Guisong He
    Apr 3, 2019 at 11:06
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    Right, --user-unit combines --user and -u ;-).
    – Stephen Kitt
    Apr 3, 2019 at 11:08

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