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.