From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: Getting the commit that corresponds to a specific annotated tag
Date: Fri, 01 Jun 2012 15:00:04 -0700
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References: <CA+mfgz2=ZFBetSGv1Bkq6orBbpVTS1k0gLVm0nGoR1sUDkDwqQ@mail.gmail.com>
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To: Adam Mercer <ramercer@gmail.com>
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Adam Mercer <ramercer@gmail.com> writes:

> For some porcelain I'm writing I need to determine the commit that
> corresponds to a given annotated tag, so far I have the following:
>
> $ git cat-file tag <tag_name> | grep object | awk '{print $2}'
>
> Is there already some pluming that performs this task?

I think you want

	git rev-parse $tag^{commit}

It's kind of scary, though.