[Solved] Why does grep 'pattern' file1 file2 prefix output lines with filenames? — Ans: Because multiple files are searched, grep shows filename to identify source | Linux CLI

Linux CLI - Text Processing

Why does grep 'pattern' file1 file2 prefix output lines with filenames?

ABecause the files are binary

BBecause the pattern is case-insensitive

CBecause grep is run with -v option

DBecause multiple files are searched, grep shows filename to identify source

Step-by-Step Solution

Solution:

Step 1: Understand grep output format
When searching multiple files, grep prefixes matched lines with the filename to show which file the line came from.
Step 2: Check other options
Case sensitivity, binary files, or -v option do not cause filename prefixes.
Final Answer:
Because multiple files are searched, grep shows filename to identify source -> Option D
Quick Check:
Multiple files searched = filename prefix in output [OK]

Quick Trick: Multiple files searched? grep shows filename prefix [OK]

Common Mistakes:

Master "Text Processing" in Linux CLI

9 interactive learning modes - each teaches the same concept differently

More Linux CLI Quizzes

Why does grep 'pattern' file1 file2 prefix output lines with filenames?