takes a directory of files and randomizes the names by prefixing them with a number

jumbler.rb

# encoding: utf-8
require "fileutils"

include FileUtils::Verbose

def usage
  puts "usage: jruby ORIGINAL_MUSIC_DIR"
end

if ARGV[0] and File.directory? ARGV[0]
  jumbled_dir = "jumbled_#{ARGV[0]}"
  puts "copiying #{ARGV[0]} to jumbled_dir"
  mkdir_p jumbled_dir
  files = Dir.glob(ARGV[0] + "/*")
  files.shuffle.each_with_index do |file, index|
    cp file.force_encoding("utf-8"), File.join(jumbled_dir, index.to_s + "-" + File.basename(file))
  end
else
  usage
end