How to sort,uniq and display line that appear more than X times

Question

I have a file like this:

80.13.178.2
80.13.178.2
80.13.178.2
80.13.178.2
80.13.178.1
80.13.178.3
80.13.178.3
80.13.178.3
80.13.178.4
80.13.178.4
80.13.178.7
         


        

Answer 1

Feed the output from uniq -cd to awk

sort test.file | uniq -cd | awk -v limit=2 '$1 > limit{print $2}'