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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.unix.shell
Subject: Re: Different variable assignments
Date: Sat, 12 Oct 2024 21:32:33 -0000 (UTC)
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On Sat, 12 Oct 2024 17:57:16 +0200, Frank Winkler wrote:

> I'm still thinking about the difference between "< <(...)" and "<<<
> `...`"

Not sure about the extra “<”, but “<(«cmd»)” gets substituted with the 
name of a file (i.e. not stdin) that the process can open and read to get 
the output of «cmd». Similarly “>(«cmd»)” gets substituted with the name 
of a file (i.e. not stdout) that the process can open and write to feed 
input to waiting «cmd».

“<<” and “<<<”, on the other hand, are for specifying alternative sources 
of inline data for stdin, or you can use “«fd»<<” and “«fd»<<<” to specify 
an alternative «fd» that the process will expect to find already open for 
reading, to obtain that data.