Which description best matches the grep command?

Which description best matches the grep command?

• A. A Windows tool for creating shortcuts
• B. A Linux command that lists files in a directory
• C. A Linux command to view the contents of a file
• D. A Linux command that searches files for patterns using regular expression metacharacters

Answer: (D)

grep is a Linux command that searches inside text for lines that match a specified pattern. The pattern is treated as a regular expression, so you can use metacharacters to create flexible search rules—anchors like ^ and $, character classes like [a-z], repetition like * and +, and alternatives with |. When you run it with a file or multiple files, grep outputs the lines that contain matches, which makes it a powerful way to filter text or extract specific information. This is different from a Windows tool for creating shortcuts, a command that lists files in a directory, or a command that simply shows file contents; grep’s purpose is specifically to search within text using patterns.

grep is a Linux command that searches inside text for lines that match a specified pattern. The pattern is treated as a regular expression, so you can use metacharacters to create flexible search rules—anchors like ^ and $, character classes like [a-z], repetition like * and +, and alternatives with |. When you run it with a file or multiple files, grep outputs the lines that contain matches, which makes it a powerful way to filter text or extract specific information. This is different from a Windows tool for creating shortcuts, a command that lists files in a directory, or a command that simply shows file contents; grep’s purpose is specifically to search within text using patterns.