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Date: Wed, 31 Aug 2005 11:35:28 -0700
From: Gary Kline <kline@tao.thought.org>
To: Philip Hallstrom <freebsd@philip.pjkh.com>
Message-ID: <20050831183528.GA58621@thought.org>
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	<20050831111755.V2009@wolf.pjkh.com>
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Cc: Gary Kline <kline@tao.thought.org>,
	FreeBSD Mailing List <freebsd-questions@FreeBSD.ORG>
Subject: Re: Doing a modulo in /bin/sh??
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On Wed, Aug 31, 2005 at 11:18:57AM -0700, Philip Hallstrom wrote:
> >	I can grab the results of "w=$date+%U)"; in C an use the modulo
> >	operator; is there a way to do this is /bin/sh?  ot zsh?
> >
> >	tia, guys,
> >
> >	gary
> >
> >#/bin/sh
> >w=$(date +%U)
> >echo "w is $w";
> >(even=$(w % 2 ));       ## flubs.
> >echo "even is $even";       ## flubs.
> >
> >if [ $even -eq 0 ]       ## flubs, obv'ly.
> >then
> >       echo "week is even";
> >else
> >       echo "week is odd";
> >fi
> 
> Take a look at 'expr'....
> 
> philip@foxtrot:~ 
> % expr 1 % 2
> 1
> philip@foxtrot:~ 
> % expr 2 % 2
> 0
	Thankee, sir; I forgot that with ash/sh/<&c>, y'gotta use
	expr; and inside backticks in cases like this one. 

	gary


#/bin/sh
w=$(date +%U)
echo "w is $w";
even=`expr ${w} % 2`;

echo "even is $even";
if [ $even -eq 0 ]
then
        echo "week is even";
else
        echo "week is odd";
fi


-- 
   Gary Kline     kline@thought.org   www.thought.org     Public service Unix