05-28-2013
It might help if you could clarify which files exactly you are searching for. If, for instance, a file exists in dir1 and dir2, but not in dir3 and dir4, should it be included or not? How about a file existing in dir1, dir2, dir3 but not in dir4? Does "dir1" take any precendence or should a file existing in dir1 and dir2 but not in dir3 and dir4 be treated the same as one existing in dir2 and dir4 but not in dir1 and dir3?
In other words, could you clarify the rules by which you want to find files? A possible solution (maybe not even relying on "diff") wil depend on how you answer these questions.
I hope this helps.
bakunin
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