Example based guide to mastering GNU awk.

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<img src="./images/gawk.png" width="320px" height="400px" />

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Exercises not yet included, but will be added soon...

See [Version_changes.md](./Version_changes.md) to keep track of changes made to the book.

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You can purchase the book using these links:

* https://gumroad.com/l/gnu_awk

* https://leanpub.com/gnu_awk

* You can also get the book as part of **Magical one-liners** bundle from https://gumroad.com/l/oneliners or https://leanpub.com/b/oneliners

* See https://learnbyexample.github.io/books/ for list of other books

For a preview of the book, see [sample chapters](https://github.com/learnbyexample/learn_gnuawk/blob/master/sample_chapters/awk_sample_chapters.pdf)

The book can also be [viewed as a single markdown file in this repo](./gnu_awk.md). See my blogpost on [generating pdf from markdown using pandoc](https://learnbyexample.github.io/tutorial/ebook-generation/customizing-pandoc/) if you are interested in the ebook creation process.

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Please open an issue if you spot any typo/errors.

I'd also highly appreciate your feedback about the book.

Goodreads: https://www.goodreads.com/book/show/52758608-gnu-awk

Twitter: https://twitter.com/learn_byexample

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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

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* [GNU awk documentation](https://www.gnu.org/software/gawk/manual/) — manual and examples

* [stackoverflow](https://stackoverflow.com/) and [unix.stackexchange](https://unix.stackexchange.com/) — for getting answers to pertinent questions on `bash`, `awk` and other commands

* [tex.stackexchange](https://tex.stackexchange.com/) — for help on `pandoc` and `tex` related questions

* Cover image: [LibreOffice Draw](https://www.libreoffice.org/discover/draw/)

* [softwareengineering.stackexchange](https://softwareengineering.stackexchange.com/questions/39/whats-your-favourite-quote-about-programming) and [skolakoda](https://skolakoda.org/programming-quotes) for programming quotes

* [Warning](https://commons.wikimedia.org/wiki/File:Warning_icon.svg) and [Info](https://commons.wikimedia.org/wiki/File:Info_icon_002.svg) icons by [Amada44](https://commons.wikimedia.org/wiki/User:Amada44) under public domain

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

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The book is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-nc-sa/4.0/)

The code snippets are licensed under MIT, see [LICENSE](./LICENSE) file