From: Eric Cook <llua@gmx.com>
To: zsh-users@zsh.org
Subject: Re: Strange parameter visibility
Date: Sat, 17 Sep 2016 21:42:08 -0400 [thread overview]
Message-ID: <831b307a-a00f-1df7-5136-17fcb769ccaf@gmx.com> (raw)
In-Reply-To: <87bmzmtmzq.fsf@alfa.kjonca>
On 09/17/2016 02:11 PM, Kamil Jońca wrote:
>
> --8<---------------cut here---------------start------------->8---
> %(x=1; x=2 echo | echo $x ; echo $x)
> 1
> 1
> --8<---------------cut here---------------end--------------->8---
>
> but :
> --8<---------------cut here---------------start------------->8---
> %(x=1; x=2 | echo $x ; echo $x)
> 2
> 2
> --8<---------------cut here---------------end--------------->8---
>
> What there are "2"-s in second example?
> should'n "x=2" be treated as simple null command with its own
> assignement?
> KJ
>
It's a normal assignment just like the x=1. the weirdness is zsh
optimizing out a fork in the pipeline, so the scope of the
reassignment wasn't just a subshell.
Though, in the first example you put the variable into echo's
environment, the shell parameter x wasn't changed at all.
next prev parent reply other threads:[~2016-09-18 2:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-17 18:11 Kamil Jońca
2016-09-18 1:42 ` Eric Cook [this message]
2016-09-18 4:37 ` Bart Schaefer
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