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Re:Problem solving with Unix commands by FelipeCortez on Thursday February 14, 2019 @06:32PM (#19167114)
The AWK programming language book is excellent!

https://archive.org/download/pdfy-MgN0H1joIoDVoIC7/The_AWK_P...

You can find some discussion about it here: https://news.ycombinator.com/item?id=13451454

Re:Problem solving with Unix commands by voltagex_ on Friday February 15, 2019 @12:00AM (#19168559)
>This book was typeset in Times Roman and Courier by the authors, using an Autologic APS-5 phototypesetter and a DEC VAX 8550 running the 9th Edition of the UNIX operating system.

Delightful!