From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Alex Riesen" <raa.lkml@gmail.com>
Subject: Re: Adding color to git diff output.
Date: Wed, 12 Apr 2006 09:38:55 +0200
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To: "Linus Torvalds" <torvalds@osdl.org>
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On 4/12/06, Linus Torvalds <torvalds@osdl.org> wrote:
> +if [ "$GIT_DIFF_PAGER" ] && tty -s <&1; then

Maybe use "-t" here? I have at least one system which has no tty installed.
Like this:

  if [ -n "$GIT_DIFF_PAGER" -a -t ]; then
...