Who does "classic shell scripting" nowadays?
Maybe some IT geek, hackers, linux distribution developers... and embedded engineers!
If you develop embedded system based on linux, you will have to do with sh scripts & friends.
You can do a lot of things with a good script, better than writing your-own-cross-compiled-c-code.
This book can help you in going deep and use the power you have immediately available even on the smallest linux busybox installation.
I liked it, I enjoyed reading it, and it helped (and helps) me in my work.
I found the awk chapter a bit less good, but this is not a book on awk.

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