What is the purpose of the grep command in computing?

• A. A programming language for data analysis
• B. A command-line tool to search for patterns in text using regular expressions
• C. A version control function
• D. A database indexing method

Answer: (B)

The main idea is that grep is a command-line tool designed to find text that matches patterns. It searches through files or input streams using regular expressions and prints the lines that contain matches, making it ideal for filtering logs, source code, or any text data. This powerful pattern-matching capability is what sets grep apart from other tools, and it’s not a programming language, a version control feature, or a database indexing method. In short, grep helps you locate specific text efficiently by leveraging flexible patterns.