Re: Sub shell mit pipes

[Chet Ramey]

Paul Jarc wrote:

> Enrique Perez-Terron <enrio@online.no> wrote:
>
> > Is there any formal requirement dictating that the 'while' statement
> > shall be executed in a sub-shell?
>
>
> Not that I can find, but I imagine it makes the code simpler.

Think job control.  Different elements of pipelines running in
different process groups makes job control impossible.

Posix has traditionally required that each element of a pipeline run
in a `subshell environment', but allowed the ksh behavior as an
extension.

Chet
--
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( ``Discere est Dolere'' -- chet )
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Chet Ramey, ITS, CWRU    chet@po.CWRU.Edu 
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