Stephen Bourne's Unix System V environment clearly states the UNIX programming philosophy AND is concise. I bought this book when it was still in print, and I still use it regularly.Most of us won't use the troff (and maybe even the vi chapters) but the systems programming chapter and the shell chapters are still very good. Currently Unix/Linux references look like telephone directories, if you want to learn more and read less, this book might work for you.
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