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Re:Chess Written in GNU Sed by chasil on Monday October 16, 2023 @04:52PM (#37906445)
For awk, start with the book by Kernighan/Aho/Weinberger. The PDF of the first edition is freely available on archive.org, and a second edition has been announced. Chapter 2 of the first edition is only 40 pages, and describes all language features.

https://news.ycombinator.com/item?id=13451454

For sed, the best resource is likely the free "UNIX Bookshelf" from O'Reilly that can be found online; this contains a book specifically focusing on Sed and Awk.

https://freecomputerbooks.com/The-Unix-CD-Bookshelf-Version-...

Re:Chess Written in GNU Sed by Brentward on Monday October 16, 2023 @05:13PM (#37906723)
The second edition is out! I started reading it last week, and it's great so far.

https://www.awk.dev/