I really hate it when the recommended install method is curl-ing some script directly into a shell, often as root. Especially since it's pretty well known that the remote end can tell whether it's going to a script or a file.

Quarkdown's page has this:

curl -fsSL https://raw.githubusercontent.com/quarkdown-labs/get-quarkdo... | sudo env "PATH=$PATH" bash

And… yuck. And that ".sh" is kind of annoying all by itself.