As you may have guessed, the reason Data::Dumper is returning empty is because you are feeding it an empty variable. The reason
%nic is empty is because you are having scoping issues. You declare a hash
%nic on line 5 of the posted code and that is what gets fed into your print statement on line 45. However, on lines 10 and 28 you have the statement
my %nic;. This creates a new variable, scoped to each iteration of your for loops, that overrides the previous entry in the symbol table so long as it is in scope - see
Private Variables via my(). The solution to your problem should be as simple as deleting lines 10 and 28.
Update: See ikegami's response below, regarding creating a array of hashes to export your results. It is a scoping issue, but not quite what I initially thought.
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