bash problem

[der.hans]

Am 29. May, 2002 schwätzte Lynn David Newton so:

> I'm teaching Unix/Linux at UACT. In tonight's class I
> came across a strange bash problem in connection with
> arithmetic evaluation. I'm wondering if there is a
> version problem.
>
> o The system students have for use is running Red Hat
>   6.2 (!)

Check that you're using bash2 rather than bash 1.x.

> o I'm trying to demonstrate the superiority in
>   performance using arithmetic evaluation over the old
>   technique of using eval to increment variables.
>
> o The following command line works fine in ksh and also
>   in bash 2.05-8
>
>   aa=1; time while ((aa <= 1000)); do ((aa += 1)); done

BTW, that's an excellent demo. Almost instantanteous for the arith eval vs.
almost 6 seconds using expr. 15 sec on my p133, but still almost
instantaneous for the arith eval version.

ciao,

der.hans
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