Date: Wed, 04 Dec 96 10:26:25 +0100 From: garyj@frt.dec.com To: sln@public.jn.sd.cn Cc: questions@freebsd.org Subject: Re: shell programming Message-ID: <9612040926.AA21832@cssmuc.frt.dec.com> In-Reply-To: Message from sln@public.jn.sd.cn of Wed, 04 Dec 96 16:52:06 %2B0800.
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sln@public.jn.sd.cn writes: > Hi, > > I want to calculate intergers under Bourne Shell, I input the following: > > a=10 <enter> > a='expr $a+10' <enter> > should read a=`expr $a + 10` the backquotes and spaces are important. You could have found this out by reading the man page. > Further more, I want to know a general way to do some calculation using > variables under unix shell. > depends on the shell, e.g. bash has built-ins for this sort of thing. expr is probably the best way to do this since it should work for all shells. --- Gary Jennejohn (work) gjennejohn@frt.dec.com (home) Gary.Jennejohn@munich.netsurf.de (play) gj@freebsd.org
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