Which option prints lines that do not match the given pattern?

• A. grep -n
• B. grep -i
• C. grep -E
• D. grep -v

Answer: (D)

To print lines that do not match a given pattern, you use the invert-match option of grep. Grep normally shows lines that contain the pattern you specify; the invert flag flips this behavior, so it outputs only the lines where the pattern does not occur. For example, grep -v 'error' file prints all lines that do not contain the word error. The other flags in the options change how matches are found but don’t invert the result: one adds line numbers to matching lines, another makes the search case-insensitive, and another enables extended regular expressions. So the feature that selects non-matching lines is the invert-match option.