Linux CLI - Text Processing
You want to replace the word 'cat' with 'dog' only on lines 2 to 4 in a file named
pets.txt. Which sed command achieves this?You want to replace the word 'cat' with 'dog' only on lines 2 to 4 in a file named pets.txt. Which sed command achieves this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand address range in sed
To apply a command only on specific lines, usestart,endcommandsyntax, e.g.,2,4s/pattern/replacement/.Step 2: Match the correct syntax
sed '2,4s/cat/dog/' pets.txt correctly uses2,4s/cat/dog/to replace 'cat' with 'dog' on lines 2 to 4.Final Answer:
sed '2,4s/cat/dog/' pets.txt -> Option CQuick Check:
Use line range before command to limit sed action [OK]
Quick Trick: Use 'start,end' before 's' to limit substitution lines [OK]
Common Mistakes:
- Placing line numbers after substitution command
- Using incorrect range syntax like '2-4'
- Adding slashes around line numbers
Master "Text Processing" in Linux CLI
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