I like "The Linux Command Line" by William Shotts:

http://linuxcommand.org/tlcl.php

Available under a Creative Commons license for download and hard-copy for purchase.

On Sun, Jul 17, 2016 at 8:21 AM, Stewart C. Russell via talk <talk@gtalug.org> wrote:
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.

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