[GTALUG] Suggestions: A Book for a Beginner, new to the Linux Shell

A discussion came up in the Toronto Raspberry Pi Meetup* about suggestions for learning to work in bash. We didn't come up with anything much, but if you have any suggestions, I'd be grateful to hear them. cheers, Stewart *: We had a demo of a Thing That Made Really Big Sparks, plus How Not To Cool a Raspberry Pi 3. It was fun.