We found 2 Reddit comments about Think UNIX. Here are the top ones, ranked by their Reddit score.
Think Unix is the book I started with. It's works as a grammar book would teach you how to string together words to complete a thought. It was an enjoyable read and started me on the road to Unix over a decade ago.
I leant it to someone and never got my original copy back. I need to order another...
I liked Think Unix quite a bit.