dedup.rb

#!/usr/local/bin/macruby

##
# Remove any duplicate tracks in iTunes
# PJ Hyett was here 11/2008

framework "Cocoa"
framework "ScriptingBridge"

itunes = SBApplication.applicationWithBundleIdentifier("com.apple.iTunes")
finder = SBApplication.applicationWithBundleIdentifier("com.apple.Finder")

dups = []
seen = Hash.new { |hash, key| hash[key] = true; false }
itunes.sources.first.userPlaylists.first.fileTracks.each do |track|
  if seen[track.name] && track.location.absoluteString =~ /%20[12]\.m4[ap]$/
    dups << track
  end
end

dups.each do |track|
  finder.items.objectAtLocation(track.location).delete
end

# Uncomment the following lines if you want to immediately empty the trash
#finder.trash.warnsBeforeEmptying = false
#finder.trash.emptySecurity(false)

# then run this applescript to remove dead tracks from playlist
# http://dougscripts.com/itunes/scripts/ss.php?sp=removedeadsuper
# I'd would like to figure out the ScriptingBridge equivalent