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From: "Brian K. White" <brian@aljex.com>
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References: <87r7324zyh.fsf@asfast.com> <ltd5emv9lh.fsf@newsol.starnix.com><009101c673f7$06b3f090$6500000a@venti> <877j4ujizh.fsf@asfast.com><ltejz1sfj1.fsf@newsol.starnix.com><060510204131.ZM11934@torch.brasslantern.com> <lt8xp8sko1.fsf@newsol.starnix.com>
Subject: Re: File locking within zsh?
Date: Thu, 11 May 2006 12:13:03 -0400
Organization: Aljex Software
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----- Original Message ----- 
From: "Tim Writer" <tim@starnix.com>
To: "Bart Schaefer" <schaefer@brasslantern.com>
Cc: <zsh-users@sunsite.dk>
Sent: Thursday, May 11, 2006 10:25 AM
Subject: Re: File locking within zsh?


> Bart Schaefer <schaefer@brasslantern.com> writes:
>
>> On May 10,  6:04pm, Tim Writer wrote:
>> }
>> } IIRC, zsh avoids forking in subshells but don't most
>> } shells implement subshells with fork()?
>>
>> Zsh forks for subshells, too.  It may avoid an *additional* fork when
>> the only thing the subshell does is execute an external command, but
>> it always forks at least once.
>
> Okay. But I don't understand this:
>
>    tim@ganesh% echo $ZSH_VERSION
>    4.2.5
>    tim@ganesh% echo $$; ( echo $$ )
>    18095
>    18095
>    tim@ganesh%

Without special measures, wouldn't both $$ be expanded at the same time 
before the line is executed, before the subshell is forked?

However, I avoid all possible globbing issues and still get your result:
set |(cat;set) |less

'$'=6511
PPID=6474
'$'=6511
PPID=6474

Brian K. White  --  brian@aljex.com  --  http://www.aljex.com/bkw/
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