XK0-006 System Management Practice Question
A technician needs to replace all occurrences of '192.168.1.' with '10.0.0.' in the file /etc/network/interfaces and save the changes. 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
✓
sed -i 's/192\.168\.1/10.0.0/g' /etc/network/interfaces
Uses `sed -i 's/192\.168\.1/10.0.0/g' /etc/network/interfaces`. The backslashes escape the dots, matching literal periods. The `-i` flag edits the file in-place. This replaces '192.168.1' (without the trailing dot) with '10.0.0', leaving the trailing dot intact, resulting in '10.0.0.' as required. Options A and C have unescaped dots, which match any character, making them imprecise. Option D also has unescaped dots and would incorrectly replace any character in place of the dots. Additionally, option C redirects to the same file, which can truncate it before reading completes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
awk '{gsub(/192.168.1./,"10.0.0.");print}' /etc/network/interfaces > tmp && mv tmp /etc/network/interfaces
Why it's wrong here
Uses awk with unescaped dots, matching any character; also creates a temporary file but the pattern is not exact.
- ✓
sed -i 's/192\.168\.1/10.0.0/g' /etc/network/interfaces
Why this is correct
Correct: Escaped dots, in-place substitution, replaces only the first three octets, leaving the trailing dot.
- ✗
sed 's/192.168.1./10.0.0./g' /etc/network/interfaces > /etc/network/interfaces
Why it's wrong here
Unescaped dots and dangerous redirect to the same file; the shell truncates the file before sed reads it.
- ✗
sed -i 's/192.168.1./10.0.0./g' /etc/network/interfaces
Why it's wrong here
Unescaped dots in the pattern will match any character (including letters or digits) instead of literal periods, potentially corrupting the file.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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