I'm not sure I understand where your problem lies. A hash is the traditional way in Perl to check for duplicates. If your memory gets too small because you have too many different entries, you can use DB_File or any other tied hash that stores its data on disk instead of memory.

If all that fails, you can always use a database.

In reply to Re^3: remove duplicates by Corion
in thread remove duplicates by Anonymous Monk

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