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From: Greg Wooledge <wooledg@eeg.ccf.org>
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Subject: Re: Design question(s), re: why use of tmp-files or named-pipes(/dev/fd/N) instead of plain pipes?
Date: Mon, 19 Oct 2015 08:28:00 -0400
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On Sat, Oct 17, 2015 at 05:43:15PM -0700, Linda Walsh wrote:
> Chet Ramey wrote:
> >I think you're missing that process substitution is a word expansion
> >that is defined to expand to a filename.
> -----
> 	??? I've never seen a usage where it expands to a filename and
> is treated as such.

A simple example:

diff -u <(sort file1) <(sort file2)