XK0-006 System Management Practice Question
An administrator needs to replace all occurrences of 'oldhost' with 'newhost' in the file /etc/hosts. Which sed command should be used?
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/oldhost/newhost/g' /etc/hosts
sed -i 's/oldhost/newhost/g' /etc/hosts performs an in-place substitution globally.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
sed -e 's/oldhost/newhost/' /etc/hosts
Why it's wrong here
Same as A, no -i and no g flag.
- ✗
sed -n 's/oldhost/newhost/gp' /etc/hosts
Why it's wrong here
-n suppresses output, p prints, but does not modify file.
- ✗
sed 's/oldhost/newhost/' /etc/hosts
Why it's wrong here
This replaces only the first occurrence per line and outputs to stdout, not in-place.
- ✓
sed -i 's/oldhost/newhost/g' /etc/hosts
Why this is correct
This replaces all occurrences in-place.
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