LFCS Question #797: Real Exam Question with Answer & Explanation

Question

What is the effect of the egrep command when the -v option is used?

Options

• AIt enables color to highlight matching parts.
• BIt only outputs non-matching lines.
• CIt shows the command's version information.
• DIt changes the output order showing the last matching line first.

Explanation

When the -v option is used with the egrep command, it performs an inverse match, showing only lines that do not contain the specified pattern.

Common mistakes.

• A. Enabling color highlighting is typically done with options like --color or through shell configuration, not -v.
• C. Displaying version information for a command is usually achieved with --version or -V, not -v.
• D. The -v option filters lines based on whether they match a pattern; it does not alter the order of the output.

Concept tested. egrep -v option (invert match)

Reference. https://www.gnu.org/software/grep/manual/grep.html

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