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Whenever I open more than one file at the same time with emacs, as in: 

emacs foo.dat bar.dat

The window that opens will be split between the two files (a buffer for each file). I would like to avoid that. Is there a line I can place in my .emacs file to keep that from happening? I would like emacs to only open one buffer in the window, no matter how many files I'm loading.

I'm using version 23.1.1.

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The following code works for me (add into ~/.emacs):

(add-hook 'emacs-startup-hook
          (lambda () (delete-other-windows)) t)

The emacs-startup-hook is run after loading the init file and processing the command line, so all files have been loaded and opened; calling delete-other-windows leaves just one of them visible (normally the last one given on the command line).

Note: you might also need to customize inhibit-startup-screen and set it to t for the above to work.

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    It's unlikely to matter in this case, but you should always use add-hook for hooks, rather than manipulate the list directly. In an unrelated note, curiously, if inhibit-startup-screen if left off, you get exactly two windows: one for the last file on the command line and one with the startup screen.
    – Gilles 'SO- stop being evil'
    Sep 27, 2010 at 21:08

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