efaq: Scrolling only one line

 
 5.45 How can I force Emacs to scroll only one line when I move past the bottom of the screen?
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 Customize the ‘scroll-conservatively’ variable with ‘M-x
 customize-variable <RET> scroll-conservatively <RET>’ and set it to a
 large value like, say, 10000.  For an explanation of what this means,
 See(emacs)Auto Scrolling.
 
    Alternatively, use the following Lisp form in your ‘.emacs’:
 
      (setq scroll-conservatively most-positive-fixnum)