Example based guide for text processing with perl from the command line.

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

For solutions to the exercises, see Exercise_solutions.md.

See Version_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/perl-oneliners
• https://leanpub.com/perl-oneliners

You can also get the book as part of these bundles:

• Magical one-liners bundle from https://learnbyexample.gumroad.com/l/oneliners or https://leanpub.com/b/oneliners
• All books bundle bundle from https://learnbyexample.gumroad.com/l/all-books
  • Includes all my programming books

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/epub from markdown using pandoc if you are interested in the ebook creation process.

For web version of the book, visit https://learnbyexample.github.io/learn_perl_oneliners/

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

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

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

Twitter: https://twitter.com/learn_byexample

1. Preface
2. One-liner introduction
3. Line processing
4. In-place file editing
5. Field separators
6. Record separators
7. Using modules
8. Multiple file input
9. Processing multiple records
10. Two file processing
11. Dealing with duplicates
12. Perl rename command

• perl documentation — manuals, tutorials and examples
• /r/perl/ — helpful forum for beginners and experienced programmers alike
• stackoverflow — for getting answers to pertinent questions on Perl, one-liners, etc
• tex.stackexchange — for help on pandoc and tex related questions
• LibreOffice Draw — cover image
• pngquant and svgcleaner for optimizing images
• Warning and Info icons by Amada44 under public domain
• softwareengineering.stackexchange and skolakoda for programming quotes
• mdBook — for web version of the book
  • mdBook-pagetoc — for adding table of contents for each chapter
  • minify-html — for minifying html files

A heartfelt thanks to all my readers. Your valuable support has significantly eased my financial concerns and allows me to continue writing books.

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