![]() If you enjoyed this post, let us know in our community Discord or on GitHub to share your thoughts, ask questions, or just to say Hello! The recent blog post New reference pages on MDN for JavaScript regular expressions describes the updates we've made to the documentation to help you find what you're looking for and understand the syntax. If you think grep might be interesting for you, we've recently updated our regular expressions reference pages that will help you check patterns as you're searching. I think that learning grep will be one of the best steps you can take for boosting productivity when writing code, debugging, inspecting new projects, or doing some quick analysis of a project. Grep is so useful to me that it's muscle memory to type grep -r to prepare a search for a given pattern. So let's dive in and find out how to put some grep in your step! If you're unfamiliar with grep, this post will cover the basics, some common examples, including how I use it every day, and why I think it's an essential tool for developers. In this post, we'll see what grep is, what it can do, and why I think it's one of the most powerful command-line tools you will use when working with code. You'll quickly realize that you need an efficient tool to help you with the different kinds of searches you need to make that's where grep comes in. You might use your Integrated Development Environment (IDE) to search project files, your operating system's file search, or even code search through GitHub or another code hosting service. Searching through code and text is one of the most common tasks you'll be performing while you're building for the web. You might want to search for a variable, where an error message originates, a CSS class, an image used in HTML or markdown source, logs from your application – the list is endless. He took the name from the ed command string g/re/p, which translates as "global regular expression search.Wherever you are on your web development journey, you'll be searching for text or patterns in your code. Thompson spent about an hour that evening making his tool a general utility that could be used by others and renamed it as grep. ![]() He needed a tool that could search for phrases and strings within text files. ![]() McMahon was trying to identify the authors of the Federalist papers through textual analysis. His department head at Bell Labs, Doug Mcilroy, approached Thompson and described the problem one of his colleagues, Lee McMahon, was facing. Ken Thompson had extracted the regular expression search capabilities from the ed editor ( pronounced ee-dee) and created a little program - for his own use - to search through text files. The first two are bang on the third is slightly off. Thirdly, it was written overnight to satisfy a particular need. Secondly, the wealth of options can be overwhelming. The grep command is famous in Linux and Unix circles for three reasons. It also works with piped output from other commands. The Linux grep command is a string and pattern matching utility that displays matching lines from multiple files.
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