in reply to Find common lines in multiple files?
Yes.
The most relevant thing to realize about the intersection of n sets is, that intersection is an associative (and also commutative) operation, so that for computing
A ∩ B ∩ C ∩ D ...
, you can simply compute iteratively
(((A ∩ B) ∩ C) ∩ D) ...
So all that's needed is to find a way to find the intersection of two sets. This is a faq, see perlfaq4, How do I compute the intersection of two arrays?.
Reading the information into memory and outputting the result is left as an exercise to the reader.
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