XK0-006 System Management Practice Question
An administrator needs to replace all occurrences of '192.168.1.1' with '10.0.0.1' in a configuration file named config.txt. Which sed command should be used to perform an in-place edit?
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/192.168.1.1/10.0.0.1/g' config.txt
sed -i 's/192.168.1.1/10.0.0.1/g' config.txt performs global replacement in-place.
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/192.168.1.1/10.0.0.1/g' config.txt
Why this is correct
Correct in-place substitution.
- ✗
sed -i 's/192.168.1.1/10.0.0.1/' config.txt
Why it's wrong here
Missing 'g' flag, only replaces first occurrence per line.
- ✗
sed -e 's/192.168.1.1/10.0.0.1/g' config.txt
Why it's wrong here
Outputs to stdout, does not modify file.
- ✗
sed 's/192.168.1.1/10.0.0.1/g' config.txt > config.txt
Why it's wrong here
Redirection to the same file truncates it before reading, resulting in empty file.
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