Ack is designed as a replacement for 99% of the uses of grep. ack is intelligent about the files it searches. It knows about certain file types, based on both the extension on the file and, in some cases, the contents of the file.

Global Regular Expression Print is the rather un-catchy full name of grep, the staple of any Linux users toolkit. It is a search tool run from the command line that is evolved directly from Unix, and is so useful it deserved a post of its own.

You can direct grep to search through one file or many. You can also pipe in output from some other utility so that you’ll see only the information that you want to see. And, the fact that grep uses regular expressions allows you to perform searches even when you only have an approximate idea of what you’re searching for.

An invaluable guide to grep, a command line text search utility for GNU systems...

The grep command is a hugely powerful way to search through files. Like many command line utilities, once you're comfortable using it, you will discover that it is surprisingly fast and accurate.

There is a classic bit of computer wisdom that states “If you’ve got a problem, and decide to solve it with regular expressions, now you’ve got two problems.” This of course stems from the perception that regular expressions are a complicated mix of magic characters and Voodoo.

I work on a project on which I regularly want to grep the directory tree for a particular word but without including the cvs/ and doc/ directories. Happily, grep has an exclude-dir option to do just this..

This article covers two beneficial Linux tools, grep and sed. If searching for or handling text, grep and sed can increase your efficiency with Linux bash scripting and configuration files. We'll learn how to use these commands and get some helpful tips, too.

The grep search utility is one of the most essential building blocks of command line text filtering and processing. In this tutorial, we will give you a few simple examples.