[exim] Need a little bash scripting help [OT]

Góra strony
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Autor: Marc Perkel
Data:  
Dla: exim users
Temat: [exim] Need a little bash scripting help [OT]
Thanks in advance for answering my off topic question.

Looking for a simple way to use sort | uniq in a way that returns only
those lines that are duplicate more and say 3 times. A file like:

one
two
two
three
three
three
four
four
four
four

would return

three
four