Re: ${!variable@operator} does not work for variables without values; inconsistencies between present and absent [@] for @A and @a

[Chet Ramey]

On 2/20/20 6:23 PM, Arfrever Frehtes Taifersar Arahesis wrote:


> Even more strangely, quoting apparently matters...

Yes, this is a bug:

> $ echo "${VAR1[@]@A}"
> declare -rl VAR1=''

>> The question is whether the unset variables should display commands to
>> set the attributes (@A) or display any attributes (@a).
> 
> I think that it would be expected that @A prints the same as 'declare
> -p' for given variable.

That's not unreasonable, but it takes some consideration. You have to be
careful separating out these cases from the usual case, where a variable
name in a brace expansion is expanded to nothing if it's unset.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/