How to change the fonts size and style in dos mode printing?

Question

Hai Good After noon all,

        After searching a lot about the topic "How to stop the printing in last line of crystal report printing" I understand that it's not possible to do that using crystal report so I decided to change all my reports to DOS mode, I take the bill as each lines and write it into a text document file and printed that text document using a bat file.
        It's very speedy and stop printing in the last line, but now the problem with me is that I can't change the font size and font style here, the whole document is printing in the same font.
        If anybody of you know more about dos mode printing or how to change font style in dos mode printing pls share that

Thanking you all,