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(efaq)Horizontal scrolling

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How can I make Emacs automatically scroll horizontally?
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   In Emacs 21 and later, this is on by default: if the variable
`truncate-lines' is non-`nil' in the current buffer, Emacs
automatically scrolls the display horizontally when point moves off the
left or right edge of the window.

   In Emacs 20, use the `hscroll-mode'.  Here is some information from
the documentation, available by typing `C-h f hscroll-mode <RET>':

   Automatically scroll horizontally when the point moves off the left
or right edge of the window.

   - Type `M-x hscroll-mode' to enable it in the current buffer.

   - Type `M-x hscroll-global-mode' to enable it in every buffer.

   - `turn-on-hscroll' is useful in mode hooks as in:

          (add-hook 'text-mode-hook 'turn-on-hscroll)

   - `hscroll-margin' controls how close the cursor can get to the edge
     of the window.

   - `hscroll-step-percent' controls how far to jump once we decide to
     do so.