Linux CLI - Text Processing
Which of the following is the correct syntax to replace all occurrences of 'cat' with 'dog' in a file
pets.txt using sed?Which of the following is the correct syntax to replace all occurrences of 'cat' with 'dog' in a file pets.txt using sed?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand sed substitution flags
The 'g' flag after substitution means replace all occurrences in each line, not just the first.Step 2: Identify correct syntax
sed 's/cat/dog/g' pets.txt uses 's/cat/dog/g' which replaces all 'cat' with 'dog'. sed 's/cat/dog/' pets.txt replaces only first occurrence. sed 'replace cat with dog' pets.txt is invalid. sed 's/cat/dog/gp' pets.txt adds 'p' which prints lines but is not needed here.Final Answer:
sed 's/cat/dog/g' pets.txt -> Option AQuick Check:
Use 'g' flag for global replacement in sed [OK]
Quick Trick: Add 'g' flag to replace all matches per line [OK]
Common Mistakes:
- Omitting 'g' flag to replace all occurrences
- Using invalid commands like 'replace'
- Confusing print flag 'p' with substitution
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