[TUHS] Use of "{}" in the Shell?

[Sven Mascheck via TUHS]

Actually correct,  but $$ will be the same anyway, like in a better test 
case

       $ ( eval echo '$$' )

I'd put it this way:

  - Purpose of a subshell is to avoid any changes in its environment to 
kick back into the current shell
  - ... while keeping non-exported variables available.  They wouldn't 
be inherited by a new sh command.

I wonder if keeping even $$ was an unintentional side effect. Or even 
intentional:
The subshell shall see and behave very much like the original shell, 
just not leave any traces in the environment after exiting?

Cheers,
Sven

Rich Salz via TUHS:
> Because shell variables are expanded before execution
>
> [...]
>
> On Tue, Aug 4, 2026, 1:23 PM David Barto<barto at kdbarto.org> wrote:
>
>> Then why does
>> echo me; echo $$
>> ( echo parens ; echo $$ ; )
>> { echo brace; echo $$ ; }
>>
>> Always echo the same pid?