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Date: Mon, 5 Mar 2018 04:00:12 +0000
From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: Zsh Users <zsh-users@zsh.org>
Subject: Re: command substitution word joining
Message-ID: <20180305040012.ll5yx7dojubeqv6u@tarpaulin.shahaf.local2>
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Bart Schaefer wrote on Fri, Mar 02, 2018 at 21:50:32 -0800:
> On Fri, Mar 2, 2018 at 9:33 PM, Mikael Magnusson <mikachu@gmail.com> wrote:
> > echo --input-file=<(:)

Ah, thanks.

> > --input-file=/proc/self/fd/13
> > I could imagine some command taking multiple filenames with ,
> > separation perhaps? But you can't prepend anything with =(:).
> 
> You can prepend an assignment:
> 
> % foo==(:)
> % print $foo
> /tmp/zshdewoIj

This loses the O_EXCL atomicity guarantee:

% x==(:)
% ls $x 
ls: cannot access '/tmp/zshioVJpt': No such file or directory

It does work as a precommand assignment, though:

% x==(:) eval 'ls $x' 
/tmp/zsh37OnHf