Print units by mask:
systemctl list-units --all --no-legend "bi*"
systemctl list-timers --all "bi*"
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Start/stop units by mask:
systemctl stop "bi*"
systemctl start "bi*"
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Print journal logging for unit:
journalctl --no-pager -n 100 -f -u example.service
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Clean last 10 day journal entries:
journalctl --vacuum-time=10d
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Show dependent systemd services:
systemctl list-dependencies example.service --all --reverse
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Show unit path (or see status output for loaded entry):
systemctl show -p FragmentPath example.service
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Systemd check timer syntax (every minute from 05 till 23):
systemd-analyze calendar "*-*-* 05..23:*:00"
systemd-analyze calendar "*-*-* 00,01,02,03,04:*:00"
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