In the simplest terms, grep (global regular expression print) is a small family of commands that search input files for a search string, and print the lines that match it. Although this may not seem like a terribly useful command at first, grep is considered one of the most useful commands in any Unix system.

What does grep do in Linux?

What is grep ? You use the grep command within a Linux or Unix-based system to perform text searches for a defined criteria of words or strings. grep stands for Globally search for a Regular Expression and Print it out.

Why do we use grep?

Grep is a command-line tool that allows you to find a string in a file or stream. It can be used with a regular expression to be more flexible at finding strings.