I'd also suggest the manual/book for gawk[1] which introduces the language from the basics, covers newer features and also mentions which features are unique to

I'd also suggest the manual/book for gawk[1] which introduces the language from the basics, covers newer features and also mentions which features are unique to gawk [1] https://www.gnu.org/software/gawk/manual/gawk.html https://www.gnu.org/software/gawk/manual/gawk.html