[Solved] What does the sed command sed 's/cat/dog/' file.txt do? - Ans: Replaces the first occurrence of 'cat' with 'dog' on each line of file.txt | Bash Scripting

Bash Scripting - Text Processing in Scripts

What does the sed command sed 's/cat/dog/' file.txt do?

APrints lines containing 'cat' from file.txt

BReplaces all occurrences of 'cat' with 'dog' in the entire file.txt

CReplaces the first occurrence of 'cat' with 'dog' on each line of file.txt

DDeletes all lines containing 'cat' from file.txt

Step-by-Step Solution

Solution:

Step 1: Understand the sed substitution syntax
The command sed 's/cat/dog/' file.txt uses s/old/new/ which replaces only the first match per line.
Step 2: Apply to the file content
Each line in file.txt will have its first 'cat' replaced by 'dog', other occurrences remain unchanged.
Final Answer:
Replaces the first occurrence of 'cat' with 'dog' on each line of file.txt -> Option C
Quick Check:
sed s/old/new/ replaces first match per line [OK]

Quick Trick: Remember: no 'g' means only first match replaced per line [OK]

Common Mistakes:

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