XK0-006 System Management Practice Question
A technician needs to replace the string 'old_config' with 'new_config' in the file /etc/app.conf and save the changes in place. Which sed 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/old_config/new_config/g' /etc/app.conf
The -i flag edits the file in place, and the s///g substitution replaces all occurrences.
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 -i 's/old_config/new_config/g' /etc/app.conf
Why this is correct
Correct usage of in-place substitution globally.
- ✗
sed 's/old_config/new_config/' /etc/app.conf
Why it's wrong here
Without -i, changes are only shown on stdout.
- ✗
sed -n 's/old_config/new_config/p' /etc/app.conf
Why it's wrong here
-n suppresses output, p prints only changed lines, but not in-place.
- ✗
sed -i 's/old_config/new_config/' /etc/app.conf
Why it's wrong here
Missing g flag replaces only first occurrence per line.
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