How to call a plugin from command line?

Question

How to, lets say, hyphen an ebook with Hyphenate This! plugin from command line?

Answer 1

How to work with the Calibre command line can be found in this manual.

Use this command to show what you can do with plugins:

calibre-customize -h

I'm afraid Hyphenate This! is just a GUI plugin without a command line interface.

(For more advanced work with plugins, look at API documentation.)