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From: Sam Halliday <sam.halliday@gmail.com>
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Subject: Re: run emacs in batch mode without a tty
Date: Fri, 3 Jul 2015 06:26:37 -0700 (PDT)
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On Friday, 3 July 2015 13:01:01 UTC+1, Eli Zaretskii  wrote:
> If no input is expected, and you run Emacs in batch mode, what do you
> need a tty for?

Emacs won't run without one. It just crashes.