Batch File: How to put a Ruby File in a Batch File without copy everything

If you have don’t understand or not enough the title of this topic, i would like when i make the command for make a file (by example a Text File) that he have (by example a Ruby File with codes) put the data without do that: echo (the code i paste) > game.rb. I ask this question because when a make a game with by example 10 000 lines i can’t paste all the codes because it’s too big for a batch file. By example if the game have 50MB, the batch file too! Thanks you for help me for make my game.