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Learn GNU awk with hundreds of examples and exercises. Visithttps://youtu.be/KIa_EaYwGDI for a short video about the book.

The book also includes exercises to test your understanding, which are presented together as a single file in this repo —Exercises.md.

For solutions to the exercises, seeExercise_solutions.md.

You can also usethis interactive TUI app to practice some of the exercises from the book.

SeeVersion_changes.md to keep track of changes made to the book.

• You can purchase the pdf/epub versions of the book using these links:
  • https://learnbyexample.gumroad.com/l/gnu_awk
  • https://leanpub.com/gnu_awk
• You can also get the book as part of these bundles:
  • All books bundle bundle fromhttps://leanpub.com/b/learnbyexample-all-books orhttps://learnbyexample.gumroad.com/l/all-books
  • Linux CLI Text Processing bundle fromhttps://leanpub.com/b/linux-cli-text-processing orhttps://learnbyexample.gumroad.com/l/linux-cli-text-processing
  • Magical one-liners bundle fromhttps://leanpub.com/b/oneliners orhttps://learnbyexample.gumroad.com/l/oneliners
  • Awesome Regex bundle fromhttps://leanpub.com/b/regex orhttps://learnbyexample.gumroad.com/l/regex
• Seehttps://learnbyexample.github.io/books/ for a list of other books

For a preview of the book, seesample chapters.

The book can also beviewed as a single markdown file in this repo. See my blogpost ongenerating pdf/epub from markdown using pandoc if you are interested in the ebook creation process.

For the web version of the book, visithttps://learnbyexample.github.io/learn_gnuawk/

Step up your cli fu with this fabulous intro & deep dive into awk. I learned a ton of tricks!

—feedback on twitter

I consider myself pretty experienced at shell-fu and capable of doing most things I set out to achieve in either bash scripts or fearless one-liners. However, my awk is rudimentary at best, I think mostly because it's such an unforgiving environment to experiment in.

These books you've written are great for a bit of first principles insight and then quickly building up to functional usage. I will have no hesitation in referring colleagues to them!

—feedback on Hacker News

⚠️⚠️ Please DO NOT submit pull requests. Main reason being any modification requires changes in multiple places.

I would highly appreciate it if you'd let me know how you felt about this book. It could be anything from a simple thank you, pointing out a typo, mistakes in code snippets, which aspects of the book worked for you (or didn't!) and so on. Reader feedback is essential and especially so for self-published authors.

You can reach me via:

• Issue Manager:https://github.com/learnbyexample/learn_gnuawk/issues
• E-mail:echo 'bGVhcm5ieWV4YW1wbGUubmV0QGdtYWlsLmNvbQo=' | base64 --decode
• Twitter:https://twitter.com/learn_byexample

1. Preface
2. Installation and Documentation
3. awk introduction
4. Regular Expressions
5. Field separators
6. Record separators
7. In-place file editing
8. Using shell variables
9. Control Structures
10. Built-in functions
11. Multiple file input
12. Processing multiple records
13. Two file processing
14. Dealing with duplicates
15. awk scripts
16. Gotchas and Tips
17. Further Reading

• GNU awk documentation — manual and examples
• stackoverflow andunix.stackexchange — for getting answers to pertinent questions onawk and related commands
• tex.stackexchange — for help onpandoc andtex related questions
• /r/commandline/,/r/linux4noobs/,/r/linuxquestions/ and/r/linux/ — helpful forums
• canva — cover image
• oxipng,pngquant andsvgcleaner — optimizing images
• Warning andInfo icons byAmada44 under public domain
• arifmahmudrana for spotting an ambiguous explanation
• Pound-Hash for critical feedback
• FabijanC andalexwheezy for spotting ambiguous descriptions, typos and issues with commands
• mdBook — for web version of the book
  • mdBook-pagetoc — for adding table of contents for each chapter
  • minify-html — for minifying html files

Special thanks to all my friends and online acquaintances for their help, support and encouragement, especially during difficult times.

The book is licensed under aCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

The code snippets are licensed under MIT, seeLICENSE file.