From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-users-return-3414-mason-zsh=primenet.com.au@sunsite.auc.dk>
Received: (qmail 7520 invoked from network); 8 Sep 2000 22:27:53 -0000
Received: from sunsite.auc.dk (130.225.51.30)
  by ns1.primenet.com.au with SMTP; 8 Sep 2000 22:27:53 -0000
Received: (qmail 7854 invoked by alias); 8 Sep 2000 22:26:16 -0000
Mailing-List: contact zsh-users-help@sunsite.auc.dk; run by ezmlm
Precedence: bulk
X-No-Archive: yes
X-Seq: 3414
Received: (qmail 7847 invoked from network); 8 Sep 2000 22:26:14 -0000
From: "Bart Schaefer" <schaefer@candle.brasslantern.com>
Message-Id: <000908152551.ZM32355@candle.brasslantern.com>
Date: Fri, 8 Sep 2000 15:25:51 -0700
In-Reply-To: <24818.968185312@jpeek.com>
Comments: In reply to Jerry Peek <jpeek@jpeek.com>
        "Two esoteric zsh questions" (Sep  5,  1:21pm)
References: <24818.968185312@jpeek.com>
X-Mailer: Z-Mail Lite (5.0.0 30July97)
To: Jerry Peek <jpeek@jpeek.com>, zsh-users@sunsite.auc.dk
Subject: Re: Two esoteric zsh questions
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii

On Sep 5,  1:21pm, Jerry Peek wrote:
>
> (Is *any* zsh question esoteric?  Or are *all* zsh questions? ;-)

Both.

> 1) Can anyone explain the difference in the following two cases?  The
> first sets a shell variable; the second sets an environment variable.

Zefram answered this.

> 2) I wanted to compare the values of $whoson and $WHOSON.

You mean you wanted to see the differences, not just know whether there
are differences?  When I hear "compare the values" I think of

	[[ $whoson == $WHOSON ]]

> I couldn't think of a way to use two <<< operators

Right; if you did so, multios would concatenate the two inputs.

> 	% diff - <(echo $WHOSON) <<<$whoson
> 	%
> 
> Does anyone know a cleaner way to do that?

Aside from using "print -r --" in place of "echo", so that backslashes or
leading hyphens in $WHOSON won't cause problems, the only thing that comes
to mind is

	diff <(<<<$whoson) <(<<<$WHOSON)

which is really mostly same as

> 	% diff - <(cat <<<$WHOSON) <<<$whoson

except that zsh implements the "cat" internally, and you can give the args
in the same order that they'll appear in the diff output, which is slightly
more understandable.