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(1) If a username appears a ridiculous number (e.g., 42) of times in the password file, your command will print that name 41 times.   (2) While not stated as a requirement, the OP’s current code reports all the UIDs mapped to the duplicated usernames in the password file. As long as you’re handling every line in the file, and splitting it into fields, that isn’t hard to do — I’ve posted an example.

G-Man Says 'Reinstate Monica'
– G-Man Says 'Reinstate Monica'

2016-08-02 01:14:21 +00:00
Commented Aug 2, 2016 at 1:14

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