- run this script "ruby itunes-dup-remover.rb" to display duplicated files
- run with '-y' option to remove them
- create a playlist and give a unique name, "dupxxx", with in your playlists
- get duplicates by 'File'->'Show Duplicates' on your library
- add those "duplicates" into the playlist you created
- run this script "ruby itunes-dup-remover.rb -p dupxxx" to display really duplicated files
- run with '-y' option to remove them