clearup.rb

#!/usr/bin/env ruby

require 'fileutils'
include FileUtils

BAD_FILES = ['@eaDir', 'Thumbs.db']

def transverse(dir)
  cd dir do
    Dir["*"].each do |d|
      rm_rf d if BAD_FILES.include?(d)
      next unless File.directory? d
      transverse(d)
    end
  end
end

ARGV.each do |dir|
  transverse(dir)
end