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Re: 'foo > >(bar)' doesn't set $! for external foo not invoked via 'comm
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From: |
Chet Ramey |
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Subject: |
Re: 'foo > >(bar)' doesn't set $! for external foo not invoked via 'command' |
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Date: |
Mon, 20 Jul 2020 10:14:39 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
On 7/20/20 10:11 AM, Rusty Bird wrote:
> Chet Ramey:
>>>> Description:
>>>> $! isn't set to the PID of 'bar' for
>>>>
>>>> foo > >(bar)
>>>>
>>>> if 'foo' is an external program (as opposed to a builtin or
>>>> function) - unless it's invoked via 'command'.
>>
>> Redirections are performed in the subshell created to execute `foo', so the
>> process substitution is invoked there and can't affect the parent's $!.
>
> I guess my question is: Would it not make sense to always perform the
> redirection before the subshell is created?
You could make a case for it, but I'm not inclined to invalidate 30+ years
of bash backward compatibility unless the reason is a lot more compelling.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/