Perl One-Liners

Chapter 1. Introduction to Perl One-Liners

Perl one-liners are small and awesome Perl programs that fit in a single line of code. They do one thing really well—like changing line spacing, numbering lines, performing calculations, converting and substituting text, deleting and printing specific lines, parsing logs, editing files in-place, calculating statistics, carrying out system administration tasks, or updating a bunch of files at once. Perl one-liners will make you a shell warrior: what took you minutes (or even hours) to solve will now take you only seconds!

In this introductory chapter, I’ll show you what one-liners look like and give you a taste of what’s in the rest of the book. This book requires some Perl knowledge, but most of the one-liners ...