Carl Johnson <[email protected]> writes:
> [email protected] (Karl Vogel) writes:
>
>>>> On Thu, 24 Jun 2010 09:24:39 +0800,
>>>> Aiza <[email protected]> said:
>>
>> A> Receiving a variable from the command line that is suppose to contain
>> A> numeric values. How do I code a test to verify the content is numeric?
>>
>> The script below will work with the Bourne or Korn shell.
>> Results for "0 1 12 1234 .12 1.234 12.3 1a a1":
>>
>> 0 is numeric
>> 1 is numeric
>> 12 is numeric
>> 1234 is numeric
>> .12 is numeric
>> 1.234 is numeric
>> 12.3 is numeric
>> 1a is NOT numeric
>> a1 is NOT numeric
>
> You might want to try testing "123..45".
> I tried changing:
>> if expr "$arg" : "[0-9]*[\.0-9]*$" > /dev/null
> to:
> if expr "$arg" : "[0-9]*\.*[0-9]*$" > /dev/null
> but it still claims that it is numeric, so *I* must be missing
> something.
I just realized that I had a stupid mistake there and should have
used:
if expr "$arg" : "[0-9]*\.[0-9]*$" > /dev/null
--
Carl Johnson [email protected]
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