Grep is a command-line utility used to search text or search files for a particular pattern or expression. Grep stands for Global Regular Expression Print, and it is a powerful tool for searching and processing text. It can search through files, directories, and even entire disk drives for a particular pattern or phrase. Grep is not only used to search for text, but also to search for files and directories that contain a particular pattern or phrase. Grep is an incredibly useful tool for file management applications and software, as it can be used to quickly and easily locate files, directories, and text containing a particular phrase or pattern. Grep is available on all major operating systems, including Linux, Mac OS X, and Windows.
The discontinued official site has been replaced with few sentences of text without links thanking the last 25 years. The program can be safely downloaded from CNET aka Download.com.
Much simpler. Sane, modern, default.