Description

data.txt contains many lines; the password is the only line that appears exactly once. All other lines are duplicates.

Overview

• sort groups identical lines together; uniq -u then prints only lines that appear once.
• Duplicate detection with uniq requires sorted input, because uniq only compares consecutive lines.

Solution

sort data.txt | uniq -u

Password

EN632PlfYiZbn3PhVK3XOGSlNInNE00t