You are likely to be familiar with using a search dialog (usually invoked with the Ctrl+F shortcut) to locate the occurrences of a particular string. The grep command is a versatile and feature-rich version of that search functionality usable from the command line. An important feature that GUI applications may lack is regular expressions, a mini-programming language to precisely define a matching criteria.

This book heavily leans on examples to present features one by one. In addition to command options, regular expressions will also be discussed in detail. Two different implementations are discussed in this book — GNU grep and ripgrep.

Exercises are also included to test your understanding.

Prerequisites

You should be familiar with command line usage in a Unix-like environment. You should also be comfortable with concepts like file redirection and command pipelines.

You are also expected to get comfortable with reading manuals, searching online, visiting external links provided for further reading, tinkering with illustrated examples, asking for help when you are stuck and so on. In other words, be proactive and curious instead of just consuming the content passively.

If you are new to the world of the command line, check out my Computing from the Command Line ebook and curated resources on Linux CLI and Shell scripting before starting this book.

GitHub repo

Visit https://github.com/learnbyexample/learn_gnugrep_ripgrep for markdown source, example files, exercise solutions and other details related to the book.

Interactive exercises

Based on the book contents as well as the exercises, I made an interactive TUI app with 50+ questions. Reference solutions are provided for both GNU grep and ripgrep.

Feedback and Errata

I would highly appreciate it if you'd let me know how you felt about this ebook. 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_gnugrep_ripgrep/issues
• E-mail: learnbyexample.net@gmail.com
• Twitter: https://twitter.com/learn_byexample

You are likely to be familiar with using a search and replace dialog (usually invoked with the Ctrl+H shortcut) to locate the occurrences of a particular string and replace it with something else. The sed command is a versatile and feature-rich version for search and replace operations, usable from the command line. An important feature that GUI applications may lack is regular expressions, a mini-programming language to precisely define a matching criteria.

This book heavily leans on examples to present features one by one. In addition to command options, regular expressions will also be discussed in detail.

Exercises are also included to test your understanding.

Prerequisites

You should 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 command will be handy in understanding the filtering features of sed.

You are also expected to get comfortable with reading manuals, searching online, visiting external links provided for further reading, tinkering with illustrated examples, asking for help when you are stuck and so on. In other words, be proactive and curious instead of just consuming the content passively.

If you are new to the world of the command line, check out my Computing from the Command Line ebook and curated resources on Linux CLI and Shell scripting before starting this book.

Testimonials

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

GitHub repo

Visit https://github.com/learnbyexample/learn_gnused for markdown source, example files, exercise solutions and other details related to the book.

Interactive exercises

Based on the book contents as well as the exercises, I made an interactive TUI app with 50+ questions. Reference solutions are also provided.

Feedback and Errata

I would highly appreciate it if you'd let me know how you felt about this ebook. 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: learnbyexample.net@gmail.com
• Twitter: https://twitter.com/learn_byexample

About

When it comes to command line text processing, the three major pillars are grep for filtering, sed for substitution and awk for field processing. This book will dive deep into field processing, show examples for filtering features, multiple file processing, how to construct solutions that depend on multiple records, how to compare records and fields between two or more files, how to identify duplicates while maintaining input order and so on.

This book heavily leans on examples to present features one by one. Regular Expressions will also be discussed in detail.

Exercises are also included to test your understanding.

Prerequisites

You should 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 and sed commands will be handy in understanding the filtering and substitution features of awk.

As awk is a programming language, you are also expected to be familiar with concepts like variables, printing, functions, control structures, arrays and so on.

You are also expected to get comfortable with reading manuals, searching online, visiting external links provided for further reading, tinkering with illustrated examples, asking for help when you are stuck and so on. In other words, be proactive and curious instead of just consuming the content passively.

If you are new to the world of the command line, check out my Computing from the Command Line ebook and curated resources on Linux CLI and Shell scripting before starting this book.

Testimonials

Step up your cli fu with this fabulous intro & deep dive into awk. I learned a ton of tricks! — feedback on twitter

I consider myself pretty experienced at shell-fu and capable of doing most things I set out to achieve in either bash scripts or fearless one-liners. However, my awk is rudimentary at best, I think mostly because it's such an unforgiving environment to experiment in. These books you've written are great for a bit of first principles insight and then quickly building up to functional usage. I will have no hesitation in referring colleagues to them! — feedback on Hacker News

GitHub repo

Visit https://github.com/learnbyexample/learn_gnuawk for markdown source, example files, exercise solutions and other details related to the book.

Interactive exercises

Based on the book contents as well as the exercises, I made an interactive TUI app with 80+ questions. Reference solutions are also provided.

Feedback and Errata

I would highly appreciate it if you'd let me know how you felt about this ebook. 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_gnuawk/issues
• E-mail: learnbyexample.net@gmail.com
• Twitter: https://twitter.com/learn_byexample

The book heavily leans on examples and exercises to help you get comfortable with using Ruby from the command line. It is recommended that you manually type each example and experiment with them.

Prerequisites: You should be comfortable with programming basics and have prior experience working with Ruby. You should know concepts like blocks, be familiar with string/array/hash/enumerable methods, regular expressions etc. You should also have prior experience working with command line and bash shell and be familiar with concepts like file redirection, command pipeline and so on.

Visit https://github.com/learnbyexample/learn_ruby_oneliners for code snippets and exercise files. The repo also has solutions for exercises.

Testimonials

This Ruby one-liners cookbook is incredible. Pretty mind boggling all the stuff you can do.

— feedback on twitter

Offers

To celebrate the new release of "Perl One-Liners Guide", you can avail the following offers:

• Perl One-Liners Guide is FREE
• All Books Bundle is $12 (normal price $32) — all my 13 programming ebooks

About

When it comes to command line text processing, there are several well known tools like grep for filtering, sed for substitution and awk for field processing. Compared to such tools, Perl has a feature rich regular expression engine, plenty of builtin modules and a thriving ecosystem. Another advantage is that Perl is more portable.

Perl One-Liners Guide will show examples for filtering and substitution features, field processing, using standard and third-party modules, multiple file processing, how to construct solutions that depend on multiple records, how to compare records and fields between two or more files, how to identify duplicates while maintaining input order and so on.

This book heavily leans on examples to present features one by one. Exercises are also included to test your understanding.

Prerequisites

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.

You should 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.

You are also expected to get comfortable with reading manuals, searching online, visiting external links provided for further reading, tinkering with illustrated examples, asking for help when you are stuck and so on. In other words, be proactive and curious instead of just consuming the content passively.

GitHub repo

Visit https://github.com/learnbyexample/learn_perl_oneliners for markdown source, example files, exercise solutions and other details related to the book.

Chapters

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

Feedback and Errata

I would highly appreciate it if you'd let me know how you felt about this ebook. 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