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I enjoyed "Advanced Programming in the UNIX Environment" back when there we had multiple UNIX operating systems and probably more versions of standards than operating systems. Stevens carefully documented every detail (in a way where you could learn about what was going on; I also had the POSIX standards at the time which were not readable).

The book had some nice typesetting which I believe was done in the mystery language also used for man pages.

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He used troff:

"Real Unix books are written using troff and this book follows that time-honored tradition. Camera-ready copy of the book was produced by the author using the groff package written by James Clark. Many thanks to James Clark for providing this excellent system and for his rapid response to bug fixes. Perhaps someday I will really understand troff footer traps."

http://www.troff.org/pubs.html#apue

> I enjoyed "Advanced Programming in the UNIX Environment" back when there we had multiple UNIX operating systems and probably more versions of standards than operating systems.

You were bit ahead of your time if you were reading ebooks back then.

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