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References: <1422177338-85472-1-git-send-email-tomoki.sekiyama@gmail.com>
	<20150125181433.4ef7fcc8@ntlworld.com>
Date: Sun, 25 Jan 2015 19:23:51 +0100
Message-ID: <CAHYJk3Rvhb_ak2GfKXdVB6g5O8_7VLhWVmz-U2o-0wTB7qCRCw@mail.gmail.com>
Subject: Re: [PATCH] Enable further expansion of parameter name by ${!...}
From: Mikael Magnusson <mikachu@gmail.com>
To: Peter Stephenson <p.w.stephenson@ntlworld.com>
Cc: Tomoki Sekiyama <tomoki.sekiyama@gmail.com>, zsh workers <zsh-workers@zsh.org>
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On Sun, Jan 25, 2015 at 7:14 PM, Peter Stephenson
<p.w.stephenson@ntlworld.com> wrote:
> On Sun, 25 Jan 2015 04:15:38 -0500
> Tomoki Sekiyama <tomoki.sekiyama@gmail.com> wrote:
>> With this change, ${!...} will enable further expansion of parameter name,
>> which is equivalent to (P) expansion flag. This will enable zsh to run some
>> scripts using variable references for bash.
>
> Thanks, this is a useeful idea, however it looks like a bit more work
> will be necessary to avoid this being confused with the parameter called
> "!", i.e. the last programme run in the background.  Both $! and ${!}
> have that meaning.

IIRC, in bash, you can also use ${!foo} even with banghist active. We
probably don't want to replicate that feature, but make sure ${\!foo}
works I suppose?

-- 
Mikael Magnusson