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Commit ab6a5f2

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updates for version 2.0
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‎LICENSE

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MIT License
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Copyright (c) 2020 Sundeep Agarwal
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Copyright (c) 2024 Sundeep Agarwal
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal

‎README.md

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# Ruby one-liners cookbook
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# Ruby One-Liners Guide
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Example based guide for text processing with `ruby` from the command line.
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Example based guide for text processing with Ruby from the command line. Visit https://youtu.be/nsWVepZruws for a short video about the book.
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<p align="center">
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<img src="./images/ruby_oneliners.png" width="320px" height="400px" />
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</p>
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<p align="center"><img src="./images/ruby_oneliners_ls.png" alt="Ruby One-Liners Guide ebook cover image" /></p>
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The book also includes exercises to test your understanding, which is presented together as a single file in this repo - [Exercises.md](./exercises/Exercises.md)
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The book also includes exercises to test your understanding, which are presented together as a single file in this repo — [Exercises.md](./exercises/Exercises.md).
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For solutions to the exercises, see [Exercise_solutions.md](./exercises/Exercise_solutions.md).
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# E-book
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You can purchase the pdf/epub versions of the book using these links:
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* You can purchase the pdf/epub versions of the book using these links:
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* https://learnbyexample.gumroad.com/l/ruby-oneliners
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* https://leanpub.com/ruby-oneliners
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* You can also get the book as part of these bundles:
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* **Ruby text processing** bundle from https://learnbyexample.gumroad.com/l/ruby-textprocessing or https://leanpub.com/b/ruby-textprocessing
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* **Magical one-liners** bundle from https://learnbyexample.gumroad.com/l/oneliners or https://leanpub.com/b/oneliners
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* **All books bundle** bundle from https://learnbyexample.gumroad.com/l/all-books
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* Includes all my programming books
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* See https://learnbyexample.github.io/books/ for a list of other books
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* https://learnbyexample.gumroad.com/l/ruby-oneliners
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* https://leanpub.com/ruby-oneliners
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For a preview of the book, see [sample chapters](./sample_chapters/ruby_oneliners_sample.pdf).
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You can also get the book as part of these bundles:
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The book can also be [viewed as a single markdown file in this repo](./ruby_oneliners.md). See my blogpost on [generating pdfs from markdown using pandoc](https://learnbyexample.github.io/customizing-pandoc/) if you are interested in the ebook creation process.
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* **Ruby text processing** bundle from https://learnbyexample.gumroad.com/l/ruby-textprocessing or https://leanpub.com/b/ruby-textprocessing
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* **Magical one-liners** bundle from https://learnbyexample.gumroad.com/l/oneliners or https://leanpub.com/b/oneliners
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* **All books bundle** bundle from https://learnbyexample.gumroad.com/l/all-books
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* Includes all my programming books
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See https://learnbyexample.github.io/books/ for list of other books
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For a preview of the book, see [sample chapters](https://github.com/learnbyexample/learn_ruby_oneliners/blob/master/sample_chapters/ruby_oneliners_sample.pdf)
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The book can also be [viewed as a single markdown file in this repo](./ruby_oneliners.md). See my blogpost on [generating pdf/epub from markdown using pandoc](https://learnbyexample.github.io/customizing-pandoc/) if you are interested in the ebook creation process.
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For web version of the book, visit https://learnbyexample.github.io/learn_ruby_oneliners/
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For the web version of the book, visit https://learnbyexample.github.io/learn_ruby_oneliners/
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<br>
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# Feedback
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Please [open an issue](https://github.com/learnbyexample/learn_ruby_oneliners/issues) if you spot any typo/errors.
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⚠️ ⚠️ Please DO NOT submit pull requests. Main reason being any modification requires changes in multiple places.
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I'd also highly appreciate your feedback about the book.
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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.
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You can reach me via:
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Twitter: https://twitter.com/learn_byexample
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* Issue Manager: [https://github.com/learnbyexample/learn_ruby_oneliners/issues](https://github.com/learnbyexample/learn_ruby_oneliners/issues)
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* E-mail: `echo 'bGVhcm5ieWV4YW1wbGUubmV0QGdtYWlsLmNvbQo=' | base64 --decode`
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* Twitter: [https://twitter.com/learn_byexample](https://twitter.com/learn_byexample)
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<br>
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# Acknowledgements
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* [ruby-lang documentation](https://www.ruby-lang.org/en/documentation/) — manuals and tutorials
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* [/r/ruby/](https://www.reddit.com/r/ruby/) — helpful forum for beginners and experienced programmers alike
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* [stackoverflow](https://stackoverflow.com/) — for getting answers to pertinent questions on Ruby, one-liners, etc
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* [stackoverflow](https://stackoverflow.com/) — for getting answers to pertinent questions on Ruby and related commands
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* [tex.stackexchange](https://tex.stackexchange.com/) — for help on [pandoc](https://github.com/jgm/pandoc/) and `tex` related questions
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* [LibreOffice Draw](https://www.libreoffice.org/discover/draw/) — cover image
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* [pngquant](https://pngquant.org/) and [svgcleaner](https://github.com/RazrFalcon/svgcleaner) for optimizing images
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* [/r/ruby/](https://old.reddit.com/r/ruby/) — helpful forum
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* [canva](https://www.canva.com/) — cover image
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* [oxipng](https://github.com/shssoichiro/oxipng), [pngquant](https://pngquant.org/) and [svgcleaner](https://github.com/RazrFalcon/svgcleaner) — optimizing images
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* [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
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* [softwareengineering.stackexchange](https://softwareengineering.stackexchange.com/questions/39/whats-your-favourite-quote-about-programming) and [skolakoda](https://skolakoda.org/programming-quotes)for programming quotes
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* **KOTP**for spotting grammatical mistakes
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* [mdBook](https://github.com/rust-lang/mdBook) — for web version of the book
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* [mdBook-pagetoc](https://github.com/JorelAli/mdBook-pagetoc) — for adding table of contents for each chapter
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* [minify-html](https://github.com/wilsonzlin/minify-html) — for minifying html files
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A heartfelt thanks to all my readers. Your valuable support has significantly eased my financial concerns and allows me to continue writing books.
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A heartfelt thanks to all my readers. Your valuable support has significantly eased my financial concerns and allows me to continue working on programming ebooks.
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<br>
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# License
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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/)
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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/).
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The code snippets are licensed under MIT, see [LICENSE](./LICENSE) file
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The code snippets are licensed under MIT, see [LICENSE](./LICENSE) file.
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‎Version_changes.md

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<br>
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### 2.0
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* Command version updated to **Ruby 3.3.0**
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* Added more exercises
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* Long sections split into smaller ones
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* In general, many of the examples, exercises, solutions, descriptions and external links were updated/corrected
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* Updated Acknowledgements section
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* Code snippets related to info/warning sections will now appear as a single block
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* Book title changed to **Ruby One-Liners Guide**
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* New cover image
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<br>
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### 1.6
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* Corrected usage of substitution methods for fixed string replacement

‎code_snippets/Field_separators.sh

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echo ' a b c ' | ruby -ane 'puts $F.size'
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echo ' a b c ' | ruby -ane 'puts $F[0]'
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echo ' a b c ' | ruby -ane 'puts "(#{$F[0]})"'
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echo ' a b c ' | ruby -ane 'puts $F[-1] + "."'
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echo ' a b c ' | ruby -ane 'puts "(#{$F[-1]})"'
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printf ' one \t\f\v two\t\r\tthree ' | ruby -ane 'puts $F.size'
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printf ' one \t\f\v two\t\r\tthree \t\r ' | ruby -ane 'puts $F.size'
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printf ' one \t\f\v two\t\r\tthree ' | ruby -ane 'puts $F[1] + "."'
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printf ' one \t\f\v two\t\r\tthree \t\r ' | ruby -ane 'puts $F[1] + "."'
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## Input field separator
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echo 'goal:amazing:whistle:kwality' | ruby -F: -ane 'puts $F[0], $F[-1]'
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echo 'goal:amazing:whistle:kwality' | ruby -F: -ane 'puts $F[0], $F[-1], $F[1]'
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echo 'one;two;three;four' | ruby -F';' -ane 'puts $F[2]'
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## Character-wise separation
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## Newline character in the last field
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echo ':a:b:c:' | ruby -F: -ane 'puts $F.size'
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echo ':a:b:c:' | ruby -F: -ane 'puts $F.size; puts "[#{$F[-1]}]"'
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## Using the -l option for field splitting
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echo "$s" | ruby -lne 'puts $_.scan(/\d+/)[1]'
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echo "$s" | ruby -ne 'puts $_.scan(/\d+/)[1]'
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s='coat Bin food tar12 best Apple fig_42'
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echo "$s" | ruby -lne 'puts $_.scan(/[a-z]+/i) * ","'
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echo "$s" | ruby -ne 'puts $_.scan(/\b[a-z0-9]+\b/) * ","'
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s='items: "apple" and "mango"'
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echo "$s" | ruby -ne 'puts $_.scan(/"[^"]+"/)[1]'
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echo "$s" | ruby -ne 'puts $_[/"[^"]+"/]'
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ruby -lane 'print if $F.grep(/r/).size <= 1' table.txt
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echo '23 756 -983 5' | ruby -ane 'puts $F.map {|n| n.to_i ** 2} * " "'
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echo '23 756 -983 5' | ruby -ane 'puts $F.map {_1.to_i ** 2} * " "'
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echo 'AaBbCc' | ruby -lne 'puts $_.chars.map(&:ord) * " "'
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echo "$s" | ruby -ane 'puts $F.filter {|w| w[0]!="h" && w.size<6}'
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w.gsub(/[ae]/, "X") if w[0]=="h"}'
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echo '3.14,17,6' | ruby -F, -lane 'puts $F.reduce(1) {|op,n| op*n.to_f}'
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echo '3.14,17,6' | ruby -F, -lane 'puts $F.reduce(2) {|op,n| op*n.to_f}'
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echo 'foobar' | ruby -lne 'puts $_.chars.sort.reverse * ""'
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echo "$s" | ruby -ane 'puts $F.sort { |a, b|
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ruby -ane 'idx = $F.each_index.sort {$F[_2] <=> $F[_1]} if $.==1;
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