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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <141125203249.ZM18877@torch.brasslantern.com>
Date: Tue, 25 Nov 2014 20:32:49 -0800
In-reply-to: <54752574.5090205@eastlink.ca>
Comments: In reply to Ray Andrews <rayandrews@eastlink.ca>        "export" (Nov
 25,  4:57pm)
References: <54752574.5090205@eastlink.ca>
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To: Zsh Users <zsh-users@zsh.org>
Subject: Re: export
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On Nov 25,  4:57pm, Ray Andrews wrote:
} Subject: export
}
} When I export a variable it is only available in subsequent shells in 
} the same xterm. Can I make it export globally?

As others have explained, this is part of the design of the unix process
model.  With a shell, however, you can fake it:

http://unix.stackexchange.com/questions/137077/serialize-shell-variable-in-bash-or-zsh