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Date: Thu, 14 Feb 2002 17:29:05 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Tim Van Holder <tim DOT van DOT holder AT pandora DOT be>
cc: djgpp-workers AT delorie DOT com
Subject: Re: Some small bash issues
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On 14 Feb 2002, Tim Van Holder wrote:

> [tim AT bender] /home/tim>cat >fooscript <<\EOF
> More>#! /bin/sh
> More>echo $foo
> More>EOF
> [tim AT bender] /home/tim>foo=bar ./fooscript 
> bar
> [tim AT bender] /home/tim>echo $foo
> 
> [tim AT bender] /home/tim>cat >fooscript <<\EOF
> More>#! /usr/bin/perl5
> More>print $ENV{"foo"} . "\n";
> More>EOF
> [tim AT bender] /home/tim>foo=bar ./fooscript 
> bar
> [tim AT bender] /home/tim>foo=bar perl -e 'print $ENV{"foo"} . "\n";'
> bar
> [tim AT bender] /home/tim>echo $foo
> 
> [tim AT bender] /home/tim>foo=bar perl -e 'print $ENV{"foo"} . "\n";'
> bar
> 
> So running perl DOES set foo; running echo doesn't.

Yes, but that's a different issue, I think: what I was talking about is 
whether foo=bar is in effect for the duration of the single command after 
"foo=bar".  You are talking, so it seems, about whether foo=bar stays in 
effect _after_ that command exits.  I don't expect the latter to happen 
in a shell, but as for Perl, I don't know enough about its semantics to 
judge.