From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jonathan Nieder <jrnieder@gmail.com>
Subject: Re: How to git checkout a orgin(unstage) version file in another
 directoy?
Date: Thu, 17 Feb 2011 04:34:31 -0600
Message-ID: <20110217103431.GA8308@elie>
References: <loom.20110217T074533-358@post.gmane.org>
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Cc: git@vger.kernel.org, Michael J Gruber <git@drmicha.warpmail.net>
To: Chunlin Zhang <zhangchunlin@gmail.com>
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Chunlin Zhang wrote:

> 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.

Because you are writing a script, I'd suggest using one of the
"low-level commands (plumbing)" listed in git(1).  Because you are
retrieving a file, it would be one of the "interrogation commands".
And because it is a single file, I suppose this should be git
cat-file, git unpack-file, or git archive.

For example,

	git cat-file blob HEAD:README

will print the contents of README in the HEAD commit.

Because I am curious: what exactly would your script be used to do?
Can the git diff-tree or git diff-files command help?