how to get 'git diff' to output patch to file

From: Aaron Gray <aaronngray.lists@googlemail.com>
Date: May 14, 2009, 11:52 UTC
Message-ID: <93C432AD0B8F4D25A19E0D67C535376A@HPLAPTOP>

How do I get 'git diff -u' to output to a file or standard out instead of its viewer ?

Many thanks in advance,

Aaron

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