how to find out duplicate contents/records

[Kevin D. Clark]

Dave Peters writes:

> Any suggestion on how to find out duplicate
> contents/records? I find list of around 1500 username
> and would like to find out any duplicate. How can I do
> that?

Either of these two come to mind:

  sort | uniq -d 

  perl -ne '$seen{$_}++; END { map { print if ($seen{$_} > 1) } keys(%seen)}'


I assume that you have a list of just the usernames.  Redirect your
list into either of these and you'll see the dups.

Regards,

--kevin
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