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Re: processing of pipelines

X-seq: zsh-users 2545
From: Sven Wischnowsky <wischnow@xxxxxxxxxxxxxxxxxxxxxxx>
To: zsh-users@xxxxxxxxxxxxxx
Subject: Re: processing of pipelines
Date: Wed, 1 Sep 1999 10:29:24 +0200 (MET DST)
In-reply-to: "Bart Schaefer"'s message of Tue, 31 Aug 1999 22:34:44 +0000
Mailing-list: contact zsh-users-help@xxxxxxxxxxxxxx; run by ezmlm

Bart Schaefer wrote:

> ...
>
> Zsh *does* run the last command in a pipeline in the current
> shell when the command *is* a builtin, even if that builtin is a loop,
> which is AFAIK different from any other shell; it means that you can do
> things like
> 
>     some external command | while read line; do export $line; done
> 
> and the current shell's environment will actually be modified.
>
> ...

Only one more comment: once such a pipe is suspended, the shell
builtin/construct at the end is put in a sub-shell (and the
environment of the parent won't change any more, of course).

This has caused some trouble lately... (but you *can* suspend such
pipes and if you don't do that you can use parameters changed there -- 
its an attempt to get the best of both worlds).

Bye
 Sven

--
Sven Wischnowsky                         wischnow@xxxxxxxxxxxxxxxxxxxxxxx

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