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Preface - Perl One-Liners Guide

This book features plenty of Perl one-liners for solving text processing tasks from the command line. You can use Perl as a single alternate to tools like grep, sed and awk. Syntax and features of these tools (along with languages like C and bash) were inspirations for Perl, so prior experience with them would make it easier to get comfortable with Perl one-liners.

You'll learn about various command line options and Perl features that make it possible to write compact CLI scripts. Learning to use Perl from the command line will also allow you to construct solutions where Perl is just another tool in the shell ecosystem.

You should be comfortable with programming basics and have prior experience working with Perl. You should know concepts like scalar, array, hash, special variables and be familiar with control structures, regular expressions, etc. To get started with Perl and regular expressions, check out the following resources:

• perldoc: perlintro
• learnxinyminutes: perl
• perldoc: perlretut

You should also be familiar with command line usage in a Unix-like environment. You should also be comfortable with concepts like file redirection and command pipelines. Knowing the basics of the grep, sed and awk commands will come in handy as well.

• The examples presented here have been tested with Perl version 5.38.0 and includes features not available in earlier versions.
• Code snippets are copy pasted from the GNU bash shell and modified for presentation purposes. Some commands are preceded by comments to provide context and explanations. Blank lines to improve readability, only real time shown for speed comparisons, output skipped/modified for certain commands and so on.
• Unless otherwise noted, all examples and explanations are meant for ASCII input.
  • See also stackoverflow: why does modern Perl avoid utf-8 by default.
• External links are provided throughout the book for you to explore certain topics in more depth.
• The learn_perl_oneliners repo has all the code snippets and files used in examples, exercises and other details related to the book. If you are not familiar with the git command, click the Code button on the webpage to get the files.

• Perl documentation — manuals, tutorials and examples
• stackoverflow and unix.stackexchange — for getting answers to pertinent questions on Perl and related commands
• tex.stackexchange — for help on pandoc and tex related questions
• /r/perl/ — helpful forum
• canva — cover image
• oxipng, pngquant and svgcleaner — optimizing images
• Warning and Info icons by Amada44 under public domain
• mdBook — for web version of the book that you are currently reading
  • 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 working on programming ebooks.

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_perl_oneliners/issues
• E-mail: learnbyexample.net@gmail.com
• Twitter: https://twitter.com/learn_byexample

Sundeep Agarwal is a lazy being who prefers to work just enough to support his modest lifestyle. He accumulated vast wealth working as a Design Engineer at Analog Devices and retired from the corporate world at the ripe age of twenty-eight. Unfortunately, he squandered his savings within a few years and had to scramble trying to earn a living. Against all odds, selling programming ebooks saved his lazy self from having to look for a job again. He can now afford all the fantasy ebooks he wants to read and spends unhealthy amount of time browsing the internet.

When the creative muse strikes, he can be found working on yet another programming ebook (which invariably ends up having at least one example with regular expressions). Researching materials for his ebooks and everyday social media usage drowned his bookmarks, so he maintains curated resource lists for sanity sake. He is thankful for free learning resources and open source tools. His own contributions can be found at https://github.com/learnbyexample.

List of books: https://learnbyexample.github.io/books/

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Code snippets are available under MIT License.

Resources mentioned in Acknowledgements section are available under original licenses.

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