How to use
Concepts = ideas & exam hooks. Commands = CLI cards with why it matters, switches, when / when not, and alternatives. Quiz = Practice 1–2 bank + licensing / switches / variables gap drills (Check answer, like crypto).
Hover dotted terms (GNU, GPL, UID, FHS…) for a short definition. Search also finds glossary entries.
Exam: D281 → LPI 010-160 · passed 2026-08-07 · 40 Q · 60 min · pass 500. Tool kept for review. Practice on your Kali VM, the WGU lab, or the learnbench Ubuntu VPS — core CLI skills transfer (package names differ by distro).
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