https://github.com/learnbyexample/learn_gnuawk

Shell
Example based guide to mastering GNU awk

GNU AWK

Example based guide to mastering GNU awk.

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

See Version_changes.md to keep track of changes made to the book.

E-book

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

The book can also be viewed as a single markdown file in this repo. See my blogpost on generating pdf from markdown using pandoc if you are interested in the ebook creation process.

Feedback

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

Table of Contents

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

Acknowledgements

• GNU awk documentation — manual and examples
• stackoverflow and unix.stackexchange — for getting answers to pertinent questions on bash, awk and other commands
• tex.stackexchange — for help on pandoc and tex related questions
• Cover image: LibreOffice Draw
• softwareengineering.stackexchange and skolakoda for programming quotes
• Warning and Info icons by Amada44 under public domain

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

License

The book is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License

The code snippets are licensed under MIT, see LICENSE file