Bash Scripting - Text Processing in Scripts
Why does the command
sort file.txt | uniq remove duplicates correctly, but uniq file.txt alone may not?Why does the command sort file.txt | uniq remove duplicates correctly, but uniq file.txt alone may not?
hard🧠 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand uniq's behavior
uniq removes only adjacent duplicate lines.Step 2: Role of sort
sort arranges duplicates next to each other, enabling uniq to remove them.Final Answer:
uniq only removes duplicates if they are adjacent, sorting ensures adjacency -> Option DQuick Check:
uniq needs sorted input to remove all duplicates [OK]
Quick Trick: uniq removes only adjacent duplicates; sort first [OK]
Common Mistakes:
MISTAKES- Thinking uniq removes all duplicates regardless of order
- Believing uniq requires sorted input to avoid errors
- Assuming sort removes duplicates
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