Pulldown will help you quickly and easily download libraries. For example, running:
$ pulldown jquery
Will instantly download you the latest minified source of the jQuery library. We use cdnjs to search for what you looked for. It can also do versioning:
$ pulldown firstname.lastname@example.org
It's not supposed to be a replacement for Bower, nor is it meant to replicate the features, but it's designed to sit right in the middle. If you need a quick CLI way to download a library, this might just be of use.
It's fully documented in the Github repo and you can install it right now through npm:
$ npm install -g pulldown
If you do use it, please get in touch if you have any (good or bad) feedback. Would love to hear it.