LPIC-1 GNU and Unix Commands Practice Question
Which THREE of the following are correct features of the 'grep' command? (Choose three.)
⚠ Common exam trap
A common mix-up: candidates confuse `-l` (list filenames) with `-n` (show line numbers) and assume `-r` enables regex, when in fact `-r` is for recursive directory traversal and regex is the default behavior.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
-i makes the search case-insensitive
The `-i` flag in `grep` performs case-insensitive matching, so patterns like 'error' will match 'Error', 'ERROR', etc. This is a common requirement when searching log files where case may vary.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
-i makes the search case-insensitive
Why this is correct
Correct: --ignore-case.
- ✓
-v inverts the match
Why this is correct
Correct: --invert-match.
- ✓
-c counts matching lines
Why this is correct
Correct: --count.
- ✗
-l prints line numbers of matches
Why it's wrong here
-l lists filenames with matches, not line numbers.
- ✗
-r enables regular expression matching
Why it's wrong here
-r enables recursive directory search; grep uses basic regex by default.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-1 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LPIC-1 exam.