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‘command … &’ creates subshell

From: Dmitry Alexandrov
Subject: ‘command … &’ creates subshell
Date: Mon, 29 Jun 2020 23:33:49 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Dear maintainer,

I believe, that the current behaviour of GNU Bash:

        $ command cat &
        [1] 3831
        $ ps --pid $! --ppid $!
          PID TTY          TIME CMD
         3831 pts/3    00:00:00 bash
         3832 pts/3    00:00:00 cat

is problematic.  Namely it is:

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;

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

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