Re: Check the error status of process substitution

[Kerin Millar]

On Tue, 7 Jun 2022 03:25:49 +0900
Masahiro Yamada <masahiroy@kernel.org> wrote:

> My main motivation for using a process substitution is
> to reflect variable changes made in the loop
> (like 'nr_lines' in the sample code)
> to the outside of the loop.
> 
> A pipe does not work that way
> since the loop is executed in a subshell.

Bash >=4.2 supports lastpipe so that could be an option for you. It requires 
that job control be disabled but this is already the case for non-interactive 
instances. I refer you to the example beneath.

#!/bin/bash
shopt -s lastpipe
{ echo line1; false; } | while read -r; do
        captured_line=$REPLY
done
status=${PIPESTATUS[0]}
declare -p status captured_line

-- 
Kerin Millar