You run uniq file.txt | sort to remove duplicates and sort lines, but duplicates remain. What is the likely problem?

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Bash Scripting - Text Processing in Scripts

You run uniq file.txt | sort to remove duplicates and sort lines, but duplicates remain. What is the likely problem?

Auniq only removes adjacent duplicates, so sorting after uniq misses duplicates

Bsort command is not working without options

Cfile.txt is empty, so no output

Duniq requires -c option to remove duplicates

Step-by-Step Solution

Solution:

Step 1: Understand uniq behavior
Uniq removes only adjacent duplicate lines, so if duplicates are scattered, it won't remove them.
Step 2: Analyze command order effect
Sorting after uniq means duplicates are not grouped before uniq runs, so duplicates remain.
Final Answer:
uniq only removes adjacent duplicates, so sorting after uniq misses duplicates -> Option A
Quick Check:
uniq needs sorted input to remove all duplicates [OK]

Quick Trick: Sort before uniq to group duplicates for removal [OK]

Common Mistakes:

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