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Learn GNU sed with hundreds of examples and exercises. Visithttps://youtu.be/nvKyKoeiZD8 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_sed
  • https://leanpub.com/gnu_sed
• 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_gnused/

Thank you for choosing to write and share your knowledge. I read your books on CLI and sed - I think they are very comprehensive and very well explained. Keep up the great work

—feedback on twitter

⚠️⚠️ 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_gnused/issues
• E-mail:echo 'bGVhcm5ieWV4YW1wbGUubmV0QGdtYWlsLmNvbQo=' | base64 --decode
• Twitter:https://twitter.com/learn_byexample

1. Preface
2. Introduction
3. In-place file editing
4. Selective editing
5. BRE/ERE Regular Expressions
6. Flags
7. Shell substitutions
8. z, s and f command line options
9. append, change, insert
10. Adding content from file
11. Control structures
12. Processing lines bounded by distinct markers
13. Gotchas and Tricks
14. Further Reading

• GNU sed documentation — manual and examples
• stackoverflow andunix.stackexchange — for getting answers to pertinent questions onsed 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
• 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.