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Re: Sub shell mit pipes

From: Chet Ramey
Subject: Re: Sub shell mit pipes
Date: Wed, 11 Aug 2004 16:50:17 -0400
User-agent: Mozilla Thunderbird 0.7.3 (Macintosh/20040803)

Paul Jarc wrote:

Enrique Perez-Terron <address@hidden> 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

``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet )
Chet Ramey, ITS, CWRU address@hidden http://cnswww.cns.cwru.edu/~chet/

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