From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chunlin Zhang <zhangchunlin@gmail.com>
Subject: How to git checkout a orgin(unstage) version file in another directoy?
Date: Thu, 17 Feb 2011 07:00:42 +0000 (UTC)
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I am writing a script for git-gui's "Tools" menu to diff a file.
I want to checkout an origin file in a tmp directory and use the diff tool.
Now it is ok to those unstage file,but to those staged file,
I found that I do not know how to checkout the orgin(unstage) version.

In detail,I change current directory to a tmp directory,
and use for example 
'git --work-tree=. --git-dir="/media/linux/t/kernel/.git" checkout README'
 to checkout origin version.

Does anyone can help with this? 
I look the git help and can not find way till now.

Thanks!