Re: File locking within zsh?

["Brian K. White" <brian@xxxxxxxxx>]

----- Original Message ----- 
From: "Tim Writer" <tim@xxxxxxxxxxx>
To: "Bart Schaefer" <schaefer@xxxxxxxxxxxxxxxx>
Cc: <zsh-users@xxxxxxxxxx>
Sent: Thursday, May 11, 2006 10:25 AM
Subject: Re: File locking within zsh?


> Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx> 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@xxxxxxxxx  --  http://www.aljex.com/bkw/
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