From mboxrd@z Thu Jan  1 00:00:00 1970
From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Subject: Re: log/show: relative pathnames do not work in rev:path
Date: Tue, 18 Dec 2007 23:02:42 +0000 (GMT)
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Cc: Junio C Hamano <gitster@pobox.com>,
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To: Dana How <danahow@gmail.com>
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Hi,

On Tue, 18 Dec 2007, Dana How wrote:

> [lots about rev:path taking path to be relative to the project root, 
>  preferring it to be relative to the current prefix instead]
> 
> Typing an extra "./" is a big improvement over a long path prefix.

Have you tried the path completion?

Alternatively, I suggest making a script

	$ cat > $HOME/bin/git-showrel << \EOF
	#!/bin/sh
	git show "$(echo "$1" | sed "s|:|:$(git rev-parse --show-prefix)|")"
	EOF
	$ chmod a+x $HOME/bin/git-showrel

Then

	$ git showrel HEAD:file

will do what you want.

(An alias will not work, since the cwd will be the project root.)

Hth,
Dscho

P.S.: I just tried "git show HEAD~20:<filename with : in it>" and it did 
not work...  I consider this a more serious issue than the relative path 
one.