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Re: ‘command … &’ creates subshell

From: Dmitry Alexandrov
Subject: Re: ‘command … &’ creates subshell
Date: Tue, 30 Jun 2020 23:37:34 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Chet Ramey <chet.ramey@case.edu> wrote:
> On 6/29/20 4:33 PM, Dmitry Alexandrov wrote:
>> 1) unexpected, as (a) it does not seem to be documented, (b) itʼs 
>> counter-intuitive and (c) other bourne-like shells (busybox ash, dash, 
>> ksh93, mksh, zsh) does not do that;
> It's an opportunity for optimization, not a bug

I am not saying that this is a bug, only that it is inconsistent with almost 
any other bourne-like shell.

>> 2) inconvenient, as in some cases PID of the parent shell is not an 
>> appropriate substitute for the PID of the real process.

> since the results are correct.

The results are _different_ across shell and, unfortunately, results provided 
by Bash are the least useful.  Consider:

        $ command … &
        [1] 30737
        $ strace -p $!
        strace: Process 30737 attached


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