From: "Bart Schaefer" <schaefer@candle.brasslantern.com>
To: zsh-workers@sunsite.dk
Subject: Re: parameter substitution used in _values
Date: Fri, 1 Jun 2001 15:01:58 +0000 [thread overview]
Message-ID: <1010601150158.ZM19978@candle.brasslantern.com> (raw)
In-Reply-To: <200106011339.PAA14041@beta.informatik.hu-berlin.de>
On Jun 1, 3:39pm, Sven Wischnowsky wrote:
} Subject: Re: parameter substitution used in _values
}
} The problem is that the positional parameters are internally turned into
} `$argv[n]'.
This is a bit strange on many levels:
zsh% noargv() { unset argv }
zsh% showargv() {
function> echo 1=$1 2=$2 @=\($@\) argv=\($argv\) $+argv
function> noargv
function> echo 1=$1 2=$2 @=\($@\) argv=\($argv\) $+argv
function> unset argv
function> echo 1=$1 2=$2 @=\($@\) argv=\($argv\) $+argv
function> }
zsh% showargv a b c d
1=a 2=b @=(a b c d) argv=(a b c d) 1
1=a 2=b @=(a b c d) argv=() 0
1= 2= @=() argv=() 0
So `unset argv' somehow did something with a param that was already unset.
Now run `showargv' a second time in the same shell:
zsh% showargv d c b a
1=d 2=c @=(d c b a) argv=() 0
1=d 2=c @=(d c b a) argv=() 0
1= 2= @=() argv=() 0
This is sort of documented:
argv <S> <Z>
Same as *. Assigning to argv changes the local positional
parameters, but argv is *not* itself a local parameter. Deleting
argv with unset in any function deletes it everywhere, although
only the innermost positional parameter array is deleted (so * and
@ in other scopes are not affected).
It seems a bit odd that `unset argv' continues to have side effects after
argv has already been "deleted" but I guess that's just part of it being
<S>pecial.
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net
prev parent reply other threads:[~2001-06-01 15:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-06-01 13:14 Oliver Kiddle
2001-06-01 13:39 ` Sven Wischnowsky
2001-06-01 14:21 ` Oliver Kiddle
2001-06-01 15:01 ` Bart Schaefer [this message]
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