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N=5 echo $[N-1] why doesn't it work as expected

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From: Helmut Jarausch <jarausch@xxxxxxxxxxxxxxxxxxx>
To: zsh-users@xxxxxxxxxx
Subject: N=5 echo $[N-1] why doesn't it work as expected
Date: Fri, 17 Jul 2009 09:24:51 +0200 (CEST)
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Reply-to: jarausch@xxxxxxxxxxxxxxxxxxx

Hi,

sorry for this very simple question.

N=2
N=5 echo $[N-1]
displays 1 - I'd expected 4.
Would anybody please explain why?
This is with ZSH 4.3.10-dev-1

Many thanks,
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

Follow-Ups:
- Re: N=5 echo $[N-1] why doesn't it work as expected
  - From: Miek Gieben

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