Dir.glob("**/*") do |v|
  lines = []
  changed = false
  next if File.directory? v
  IO.foreach(v) {|line|
    if line =~ /mutoh(at|@)highway.ne.jp/
      lines << line.gsub(/mutoh( at |@)highway.ne.jp/, "mutomasa at gmail.com")
      changed = true
    else
      lines << line
    end
  }
  if changed
    out = open(v, "w")
    lines.each {|l|
      out.write l
    }
    out.close
  end
end