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Re: Assigning variable value in right behalf of pipeline has no effect


From: Paul Jarc
Subject: Re: Assigning variable value in right behalf of pipeline has no effect
Date: Thu, 05 Jul 2007 14:18:44 -0400
User-agent: Gnus/5.110003 (No Gnus v0.3) Emacs/21.4 (gnu/linux)

address@hidden wrote:
>> > XXX=10; { XXX=20; } | read; echo $XXX
>
> It's clear that 'read' is executed as an separate process and its
> result (REPLY variable value) is lost but 'XXX=20'  command is done by
> the same process as 'XXX=10'.

No, every element of a pipeline is executed in its own process.  So
the only commands that are executed in the main shell process are
"XXX=10" and "echo $XXX".


paul




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