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

[Chet Ramey]

On 2/19/20 5:22 PM, Arfrever Frehtes Taifersar Arahesis wrote:
>> ${variable@A} does not work for scalar variables without values, but
>> interestingly ${variable[@]@A} works for them.
> 
> More precisely, ${variable[@]@A} is non-empty, but not exactly correct.
> 
>> See difference between ${VAR1@A} and ${VAR1[@]@A} below.
> 
> ${VAR1[@]@A} is:
> declare -rl VAR1=''"
> But should be:
> declare -rl VAR1
> As in output of 'declare -p VAR1'.

The output is two blank lines:

$ cat x6b
declare -lr VAR1

echo ${VAR1@A}
echo ${VAR1[@]@A}
$ ../bash-5.0-patched/bash ./x6b



The question is whether the unset variables should display commands to
set the attributes (@A) or display any attributes (@a).

-- 
``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/