How about populating your hash with the contents of your local directories keyed off the 3 digit directory. Then as you get the listing from ftp you can iterate over it and check what is in your hash (aka what you have locally). Perhaps File::Find might be of service. 

347
 |-> 12345347.jpg
  -> 80780347.jpg
879
 |-> 34392879.jpg
  -> 37329879.jpg

and so on

In reply to Re: efficient ftp of numerous files by pzbagel
in thread efficient ftp of numerous files by Anonymous Monk

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