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From: Kevin Markle <kmarkle AT pbs DOT org>
Subject:  Re:  Doing additions in cygwin?
Date:  Thu, 22 Mar 2007 16:31:07 -0400
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After serious thinking Thrall, Bryan wrote :
> Kevin Markle wrote on Thursday, March 22, 2007 2:49 PM:
>> Hello,
>> 
>> I'm attemping to use the expr variable and am having problems. when I
>> type test=expr 1+1 or
>> test=`expr 1+1` or
>> test='expr 1 + 1' or
>> 
>> with and without quotes?? I just want to create a variable based on
>> and expression?
>
> (1) You didn't really describe what problems you're seeing (I think I
> know what they are, though).
>
> (2) expr wants separate arguments, like "expr 1 + 1", not "expr 1+1".
>
> (3) use backtics to get the output when you set the variable:
> "test=`expr 1 + 1`", not "test='expr 1 + 1'".
>
> (4) This isn't really Cygwin-specific, so it would be better to try "man
> expr" (for how to use expr) or "man bash" (for quoting rules).
>
> Hope this helps!

Thanks!

I was able to get it to work by using variables instead of actual 
numbers. So I said num1=1 and num2=3 and then did expr $num1 + $num2 
and it work :-?




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