From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-workers-request@math.gatech.edu>
Received: (qmail 9680 invoked from network); 25 May 1998 03:08:03 -0000
Received: from math.gatech.edu (list@130.207.146.50)
  by ns1.primenet.com.au with SMTP; 25 May 1998 03:08:03 -0000
Received: (from list@localhost)
	by math.gatech.edu (8.8.5/8.8.5) id XAA26129;
	Sun, 24 May 1998 23:02:18 -0400 (EDT)
Resent-Date: Sun, 24 May 1998 23:02:18 -0400 (EDT)
From: Zoltan Hidvegi <hzoli@cs.elte.hu>
Message-Id: <199805250302.WAA28908@hzoli.home>
Subject: Re: PWD parameter
In-Reply-To: <980524191600.ZM10165@candle.brasslantern.com> from Bart Schaefer at "May 24, 98 07:16:00 pm"
To: schaefer@brasslantern.com (Bart Schaefer)
Date: Sun, 24 May 1998 22:02:28 -0500 (CDT)
Cc: zsh-workers@math.gatech.edu
X-Mailer: ELM [version 2.4ME+ PL31 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Resent-Message-ID: <"0F-Ek1.0.CO6.vyDQr"@math>
Resent-From: zsh-workers@math.gatech.edu
X-Mailing-List: <zsh-workers@math.gatech.edu> archive/latest/3997
X-Loop: zsh-workers@math.gatech.edu
Precedence: list
Resent-Sender: zsh-workers-request@math.gatech.edu

> } This is exacly how zsh behaves after typeset +r PWD.
> 
> Not quite.  For example, my $HOME is /home/schaefer, but that's really a
> symlink to /extra/home/schaefer.  In zsh 3.0.5, if I do
> 
> 	cd $HOME
> 	typeset +r PWD
> 	unset PWD
> 	PWD=/extra/home/schaefer
> 	echo $PWD
> 
> then what I get back is /home/schaefer.  *That* seems a bit odd.

PWD has nullsetfn as the write function.  Since PWD is special, unset
just sets a flag in the Param node, it does not really unset anything.
The PWD=... assignment clears this flag, restoring the old value of PWD.
The assigned value is lost.

Zoltan