utf8-mac_2_utf-8.rb

#!/usr/bin/env ruby

# http://sssslide.com/speakerdeck.com/a_matsuda/rails3-recipe-book-gaiden#114

ARGV.each do |file|
  File.open(file,'r+:UTF8-MAC') do |f|
    str = f.read
    f.rewind
    f.truncate(0)
    f.set_encoding('UTF-8')
    f.write(str)
  end
end