From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ping Yin <pkufranky@gmail.com>
Subject: Any easy way to represent the first commit in a branch?
Date: Sat, 29 May 2010 11:36:55 +0800
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something like HEAD@root ?

I know i can do it with

git rev-list --reverse --first-parent HEAD | head -1