XK0-006 System Management Practice Question
A developer wants to change all occurrences of 'foo' to 'bar' in a configuration file and save the changes in-place. 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/foo/bar/g' file
sed -i 's/foo/bar/g' file performs an in-place global substitution. The -i flag edits the file directly.
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/foo/bar/' file
Why it's wrong here
Without g, it replaces only the first occurrence per line, not all.
- ✗
sed -n 's/foo/bar/p' file
Why it's wrong here
-n suppresses printing, p prints only substituted lines; file not modified.
- ✗
sed 's/foo/bar/g' file
Why it's wrong here
This prints the changes to stdout but does not modify the file.
- ✓
sed -i 's/foo/bar/g' file
Why this is correct
Correct: -i enables in-place editing.
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