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I highly recommend O'Reilly's Learning the Bash Shell in paperback form: https://www.oreilly.com/library/view/learning-the-bash/0596009658/.
The other responses you've received so far don't offer much insight into the historical background and underlying mechanics of the shell, which are crucial to understanding the "Why?"s of command-line quirkiness.
A 20 year old paperback book seems like a bad choice.
It's a 36 y/o language, mate. I still reference my copy all the time, and found it to be a great definitive resource when I was learning.
How many bash 4/5 features are you seriously using on a regular basis? What do you think is out-of-date?
Are you under the impression that that language hasn't changed?
Since it seems like you don't know much about bash at all, I promise the book will help you.
You can be someone who actually knows what they're talking about instead of making embarrassing, snarky comments that expose your lack of education on the topic at hand.
Maybe you can be the kind of person who isn't offended by questions and retaliates with personal insults. Just a thought.
Bash has had some nice minor features and syntax sugar added, but the fundamentals are entirely the same. All the examples in the book work just the same today as they did when it was written.
What was added in 4.X or 5.x that you can't live without? What do you think has changed that merits inclusion?
Thanks for your reply. I agree the 'why' is important, for me that usually makes things more intuitive