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From: Roland Winkler <Roland.Winkler@physik.uni-erlangen.de>
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Subject: Re: Detect if Emacs is running in -nw mode
Date: Sun, 30 Mar 2008 01:35:31 +0100
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Christian Herenz <herenz@physik.hu-berlin.de> writes:
> Is there something when NOT, so that I could set
> [PSEUDO-CODE]:
> (when not (window-system)
> 	(menu-bar-mode nil)
> 	(other commands i want to use when not windowed))

You can test whether the DISPLAY environment variable is set using

(getenv "DISPLAY")

In this way you can distinguish between emacs -nw running in an X
or a "pure tty" environment. Is that what you want?

Roland