# Introduction This tutorial explores the `nl` command in Linux, which is used for numbering lines in text files. We'll learn how to use this command in various scenarios, making it easier to reference specific lines in documents. This skill is particularly useful for programmers, system administrators, and anyone who works with text files regularly. Imagine you're a junior software developer working on your first big project. Your team lead has asked you to review a configuration file and discuss specific sections. Using the `nl` command will help you easily reference and discuss particular lines in the file, making your collaboration more efficient.
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