XK0-006 System Management Practice Question
A technician needs to search a log file for lines containing either 'ERROR' or 'FATAL' and display the line numbers. Which command accomplishes this?
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
✓
grep -n -E 'ERROR|FATAL' logfile
grep -n -E 'ERROR|FATAL' logfile uses extended regex with alternation and -n for line numbers. -i ignores case, but the stem does not mention case-insensitive; -v inverts match; -r is recursive.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
grep -v -E 'ERROR|FATAL' logfile
Why it's wrong here
-v inverts match, showing lines without ERROR/FATAL.
- ✗
grep -r -n 'ERROR|FATAL' logfile
Why it's wrong here
-r is for recursive; '|' literal without -E.
- ✓
grep -n -E 'ERROR|FATAL' logfile
Why this is correct
Correct: -n for line numbers, -E for extended regex.
- ✗
grep -i 'ERROR|FATAL' logfile
Why it's wrong here
-i ignores case but does not show line numbers and '|' is literal without -E.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA 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 XK0-006 exam.