Find duplicate Files and delete all except one

find_duplicates_and_delete.rb

require 'digest/md5'
 
hash = {}
 
Dir.glob("**/*").each do |filename|
  next if File.directory?(filename)
  
  key = Digest::MD5.hexdigest(IO.read(filename)).to_sym

  if hash.has_key? key
    hash[key].push filename
  else
    hash[key] = [filename]
  end
end
 
hash.each_value do |filename_array|
  if filename_array.length > 1
    filename_array.each_with_index do |filename, i|
      if i > 0
        puts "=== Deleted Identical File ===\n"
        File.delete(filename)
      else
        puts "=== Original ===\n"
      end
    end
  end
end