Robert Millan [ackstorm] wrote:
>>> There's bitwise AND and bitwise OR, and logical AND and logical OR, but
>>> for XOR there's only the bitwise version. Would be nice if the logical
>>> XOR would also be present (^^).
>> (!a) != (!b)
>>
>> should work acceptably for the situations such an operator would be used.
>
> I'm not sure what you mean. The following:
>
> (true && ! false) || (false && ! true)
> echo $?
>
> works, whereas the following:
>
> (! true) != (! false)
> echo $?
>
> shows syntax error.
That really doesn't have anything to do with the issue. The original
question concerned the arithmetic operators accepted by the expression
evaluator, not the shell language.
>> The reason it's not there is because it's not in C.
>
> Because of performance?
Because bash implements a subset of C's arithmetic language (with one
exception), and C doesn't have a logical XOR operator.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
Live Strong. No day but today.
Chet Ramey, ITS, CWRU [EMAIL PROTECTED] http://cnswww.cns.cwru.edu/~chet/
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