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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: open file from command line as new buffer?
Date: Tue, 09 Aug 2011 05:49:18 +0300
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> Date: Mon, 8 Aug 2011 19:04:07 +0200
> From: Renato <rennabh@gmail.com>
> 
> Hello, simple question: I have the emacs gui started. How can I open a
> new file, from command line, such that it will open as
> a new buffer in the existing emacs process instead of starting a new
> emacs process?

Use emacsclient, a program that comes with Emacs.  It is described in
the Emacs user manual.