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From: Barry Margolin <barmar@alum.mit.edu>
Newsgroups: gmane.emacs.help
Subject: Re: Redirectin output of call-process to a file.
Date: Wed, 22 May 2013 13:07:40 -0400
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In article <20130522150337.2e98e8ba@pcolivier.chezmoi.net>,
 Olive <diolu.remove_this_part@bigfoot.com> wrote:

> I am executing the following command:
> 
> (call-process "/usr/bin/echo" nil (:file "/tmp/test.txt") nil "hello")
> 
> According tothe documentaion this should redirect the output of th eproces to 
> the file "/tmp/test.txt" but I have this error:
> 
> Symbol's function definition is void: :file
> 
> What am I doingwrong here? I use emcs 24.3.1 on GNU/Linux.

You need to quote the list, to prevent it from being evaluated as a 
function call:

(call-process "/usr/bin/echo" nil '(:file "/tmp/test.txt") nil "hello")

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***