From mboxrd@z Thu Jan  1 00:00:00 1970
From: John Keeping <john@keeping.me.uk>
Subject: Re: [PATCH v4 0/7] git send-email suppress-cc=self fixes
Date: Mon, 10 Jun 2013 08:29:31 +0100
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Cc: Junio C Hamano <gitster@pobox.com>, git@vger.kernel.org
To: "Michael S. Tsirkin" <mst@redhat.com>
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On Mon, Jun 10, 2013 at 09:53:24AM +0300, Michael S. Tsirkin wrote:
> I vaguely remember there was some way to say
> "head of the remote I am tracking" - but I could not find it.
> Where are all the tricks like foo^{} documented?

gitrevisions(7) is what you're looking for here.

In this case I think you want '@{upstream}' or its short form '@{u}'.

> I tried fgrep '{}' Documentation/*txt and it only returned
> git-show-ref.txt which isn't really informative ...

'{' and '}' need to be escaped in AsciiDoc so you have to grep for
'\\{\\}'.