man awk and info awk and online manual
Information about various implementations of awk
- awk FAQ — great resource, but last modified 23 May 2002
- grymoire: awk tutorial — covers information about different awk versions as well
- cheat sheet for awk/nawk/gawk
- list of freely available awk implementations
Q&A on stackoverflow/stackexchange are good source of learning material, good for practice exercises as well
- awk Q&A on unix.stackexchange
- awk Q&A on stackoverflow
Learn Regular Expressions (has information on flavors other than POSIX too)
- regular-expressions — tutorials and tools
- rexegg — tutorials, tricks and more
- stackoverflow: What does this regex mean?
- online regex tester and debugger — not fully suitable for CLI tools, but most of ERE syntax works
My ebooks on CLI text processing tools
Related tools
- GNU datamash
- bioawk
- frawk — an efficient awk-like language, implemented in Rust
- goawk — POSIX-compliant awk interpreter written in Go, with CSV support
- hawk — similar to awk, but using Haskell as the text-processing language
- miller — similar to awk/sed/cut/join/sort for name-indexed data such as CSV, TSV, and tabular JSON (see this news.ycombinator discussion for other tools like this)
Miscellaneous
- unix.stackexchange: When to use grep, sed, awk, perl, etc
- awk-libs — lots of useful functions
- awkaster — Pseudo-3D shooter written completely in awk
- awk REPL — live editor (browser app)
ASCII reference and locale usage
Examples for some of the topics not covered in this book

CLI text processing with GNU awk

Further Reading