From: Bart Schaefer <schaefer@brasslantern.com>
To: Zsh Users <zsh-users@zsh.org>
Subject: Re: (AA) example
Date: Thu, 25 Oct 2012 23:06:48 -0700 [thread overview]
Message-ID: <CAH+w=7bevL0ohYThq=6LMRSKRcyNg2m-yZX33XGxCY1psejXBg@mail.gmail.com> (raw)
In-Reply-To: <50895F66.9050407@internecto.net>
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On Thursday, October 25, 2012, Mark van Dijk wrote:
> Hello list members,
>
> I'd like to ask for an example of how the A and AA parameter expansion
> flags work. The description in the manual is too complicated for me to
> grasp.
>
> I am not sure whether these flags can add a value to an (associative)
> array which already exists?
>
No, they cannot add to an existing parameter. They always work as if
array=(values...), all or nothing.
The circumstances in which one would want to use these flags, especially
AA, are very limited. They exist only for generality of the test-and-set
behavior of ${var=value} -- if you can think of a case where you want to
substitute an entire associative array into a larger expression, you might
be able to find a corresponding example where you'd want AA. Otherwise you
probably should be using ${ary[field]=value}, or assignment statements like
Peter described.
prev parent reply other threads:[~2012-10-26 6:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-25 15:48 Mark van Dijk
2012-10-25 16:27 ` Peter Stephenson
2012-10-25 23:15 ` volume label in prompt? Ray Andrews
2012-10-26 0:57 ` TJ Luoma
2012-10-26 2:42 ` Ray Andrews
2012-10-26 3:15 ` Alex Satrapa
2012-10-26 13:44 ` Benjamin R. Haskell
2012-10-26 15:44 ` Ray Andrews
2012-10-26 6:06 ` Bart Schaefer [this message]
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