How to detect that emacs is in terminal-mode?

Question

In my .emacs file, I have commands that only makes sense in graphical mode (like (set-frame-size (selected-frame) 166 100)). How do I run these onl

Answer 1

window-system is a variable defined in `C source code'. Its value is x

Documentation: Name of window system through which the selected frame is displayed. The value is a symbol--for instance, `x' for X windows. The value is nil if the selected frame is on a text-only-terminal.

Basically do a:

(if window-system
    (progn
      (something)
      (something-else)))