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Re:How to Clean Text Data at the Command Line by dredmorbius on Sunday October 18, 2020 @07:11AM (#24816989)
GNU AWK User's Guide is reasonably succinct, while being fairly comprehensive.

https://www.gnu.org/software/gawk/manual/gawk.html

The manpage alone is quite useful, though lacks some useful details.

The awk FAQ provides general background, including diffeerences between implementations:

http://www.faqs.org/faqs/computer-lang/awk/faq/

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