Date: Wed, 4 Dec 1996 16:52:06 +0800 (CST) From: sln@public.jn.sd.cn To: questions@freebsd.org Subject: shell programming Message-ID: <Pine.SOL.3.91.961204164334.2113A-100000@public.jn.sd.cn>
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Hi, I want to calculate intergers under Bourne Shell, I input the following: a=10 <enter> a='expr $a+10' <enter> when I typed "echo $a", the result from system is "expr $a+1" just the same as I typed it in the command, but as the "expr' manul says, the result should be "20", what's the problem? Further more, I want to know a general way to do some calculation using variables under unix shell. Thanks in advance! Song
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