[code=ruby]

File.open("old_file.txt", "r") {

  |file_old| File.new("new_file.txt", "w").puts file_old.read

}

File.open("old_file.txt", "r") do |old_file|

  File.open("new_file.txt", "w") do |new_file|

    new_file << old_file.read

  end

}end

[/code]