From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: General support for ! in git-config values
Date: Wed, 01 Feb 2012 17:41:20 -0800
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demerphq <demerphq@gmail.com> writes:

>> When you say "alias.co = !git checkout --foo-bar", you are not saying
>> "instead of usual aliases like 'alias.co = checkout' that defines what
>> string replaces the 'co' alias, please run !whatever command, capture
>> its output, and that is the _value_ of alias.co variable, i.e. the command
>> line that is going to be run".
>
> I think I see your point. Using the same "!" notation for "execute
> this command and exit" and "execute this command and use its result as
> the config value" might be confusing.

I am afraid that you are not seeing it.  In "alias.co = !whatever", bang
does *NOT* mean "execute this command and exit".