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Message from discussion Problem mit Argumenten und Schleife
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Gunnar Ritter  
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 More options Nov 2 2001, 12:09 pm
Newsgroups: de.comp.os.unix.shell
From: Gunnar Ritter <g...@bigfoot.de>
Date: Fri, 02 Nov 2001 18:07:31 +0100
Local: Fri, Nov 2 2001 12:07 pm
Subject: Re: Problem mit Argumenten und Schleife
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Helmut Schellong <schell...@t-online.de> wrote:
> ---------------------------------------------
>  for vname [ in word ... ] ;do list ;done
>           Each time a for command is executed, vname is set to the next
>           word taken from the in word list. If in word ... is omitted,
>           then the for command executes the do list once for each

                                                           ^^^^^^^^
>           positional parameter that is set starting from 1 (see

            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

>           ``Parameter Expansion''). [Kammzitat gesnippt]
> Welcher der vier Fälle hier gilt, wird nicht beschrieben.

Doch.

Die Beschreibung in der v7-Manpage (»if in word ... is omitted then
in "$@" is assumed«) stimmte damals nämlich nicht -

$ cat t
for i in "$@"
do
        echo "$i"
done
echo -----
for i
do
        echo "$i"
done
$ sh t

-----
$

- denn ohne positionale Parameter wurde "$@" bis SVr3 (?) zu ''
expandiert und nicht zu nichts wie heute. Wohl deshalb steht schon
in der System III-Manpage genau die Formulierung, die Du oben ohne
Quellenangabe wiedergegeben hast. Man muß sie eben nur verstehen.

Somit ist »for i« stets portabler als »for i in "$@"«, zumal die
ältere Expansionsweise von »"$@"« immer noch anzutreffen ist (vgl.
<3b978...@news.uni-ulm.de>).

Grüße,
        Gunnar


 
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