GNU General Public License for most of our software it applies also to The GNU General Public License is intended to guarantee your freedom to The GNU General Public License is a free, copyleft license for $ grep gnu gpl-3.0.txtīy default, the grep command is case-sensitive, so "gnu" is different from "GNU" or "Gnu." You can make it ignore capitalization with the -ignore-case option. In return, it prints each line to your terminal with a match. You provide the grep command a pattern and a file you want it to search. The basic grep syntax is always the same. This differs slightly from the GNU version, so if you want to follow along exactly with this article, then install GNU grep from a project like Homebrew or MacPorts. On macOS, you have the BSD version of grep. If you're using Linux, you already have grep installed. This article introduces you to some of its features I find most useful. Learning the grep command is easy, although it does take some practice. Grep uses regular expression to provide a flexible search capability.You can not only find a word in a text file you can extract the word, send it to another command, and so on. Grep works in the terminal and operates on streams of data, so you can incorporate it into complex processes.If that sounds like the modern Find function available in any word processor or text editor, then you've already experienced grep's effects on the computing industry.įar from just being a quaint old command that's been supplanted by modern technology, grep's true power lies in two aspects: (For example, "I'll have to grep my memory banks to recall that information.") In short, grep is a way to search through a file for a specific pattern of characters. It's so ubiquitous in computing that it's frequently used as a verb ("grepping through a file") and, depending on how geeky your audience, it fits nicely into real-world scenarios, too. One of the classic Unix commands, developed way back in 1974 by Ken Thompson, is the Global Regular Expression Print (grep) command.
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