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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: ubuntu 10.04 (getenv "HOSTNAME") does not work.
Date: Sun, 29 Aug 2010 22:25:50 +0300
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> From: mafeusek@gmail.com
> Date: Sun, 29 Aug 2010 20:09:47 +0200
> 
> Hallo Group Members.
> 
> (getenv "HOSTNAME") returns nil,
> while 
> 
> bash$ echo $HOSTNAME
> 
> returns host name.
> 
> weird!? :)

Does "export -p" show HOSTNAME?  If not, it is not exported by the
shell to other programs, including Emacs.