From: Louis-David Mitterrand <mito@aparima.com>
To: zsh-users@math.gatech.edu
Subject: Re: strange arithmetic
Date: Sat, 29 Nov 1997 09:40:41 -0500 [thread overview]
Message-ID: <19971129094041.42002@retriever> (raw)
In-Reply-To: <19971128200444.42485@emsphone.com>; from Dan Nelson on Fri, Nov 28, 1997 at 08:04:44PM -0600
On Fri, Nov 28, 1997 at 08:04:44PM -0600, Dan Nelson wrote:
> In the last episode (Nov 28), Louis-David Mitterrand said:
> > > > % i=0;while ! [[ $[++i] < 900 ]];do;echo $i;done
> > > > % 1
> > > > % 2
> > > > [...]
> > > > % 90
> > > >
> > > > Is this normal?
> >
> > Thanks to you and zefram, I guess I've been exposed to Perl for a little
> > too long (the time I could put off learning shell scripting ;-).
> >
> > And to think I thought I had discovered a bug in mighty zsh ..
>
> I'm not sure what Perl has to do with your confusion, unless Perl uses
> [[ .. ]] to signify arithmetic evaluation? I'd check the Perl man
> pages, but as they are split into 35 (!!!!!) sections, I won't. Thank
> goodness for "man zshall".
>
> I think [[ ]] is a builtin version of the test command, with more
> testing capabilities.
>
> You probably wanted to use the (( )) construct in zsh, to do arithmetic
> evaluation of your test.
Aha! Right. I hadn't ventured deep engough in zsh's man pages. Sorry for
taking bandwidth with "should have RTFM'd" questions.
Right now I'm trying to understand bitwise manipulations and every day
that passes I thanks zsh for being such a wonderful prototyping tool. No
need to compile stuff, just type away and here comes the result... The
$[2#10010101] stuff comes real handy there to understand binary format.
Again, congratulations to zsh's developers. It's an awesome concentrate
of intelligence sitting behind that modest '%' prompt.
--
Louis-David Mitterrand
http://www.aparima.com
mito@aparima.com
next prev parent reply other threads:[~1997-11-29 14:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-11-28 19:09 Louis-David Mitterrand
1997-11-28 19:37 ` Andrew Main
1997-11-28 20:16 ` Alain Caron
1997-11-28 20:30 ` Louis-David Mitterrand
1997-11-29 2:04 ` Dan Nelson
1997-11-29 14:40 ` Louis-David Mitterrand [this message]
1997-11-29 11:44 ` Christopher Croughton
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