calibre
Calibre Ebook Conversion
ebook-convert (ships with Calibre) is the atomic command; don't wrap it in a script unless you need something genuinely more than one line. This skill is documentation + a couple of reusable command patterns.
Prerequisite
command -v ebook-convert || echo "Install Calibre and make sure ebook-convert is on PATH"
If ebook-convert isn't on PATH, resolve it per-platform (macOS app bundle, Linux package, Windows install dir) — don't hardcode a symlink path in the skill.
Core command
ebook-convert INPUT OUTPUT [options]
Format is inferred from the output extension.
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