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Re: What has been changed in [[ -v x[@] ]]?
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From: |
alex xmb ratchev |
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Subject: |
Re: What has been changed in [[ -v x[@] ]]? |
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Date: |
Tue, 18 Jul 2023 11:21:13 +0200 |
On Tue, Jul 18, 2023, 11:03 AM alex xmb ratchev <fxmbsw7@gmail.com> wrote:
>
>
> On Mon, Jul 17, 2023, 6:22 PM Chet Ramey <chet.ramey@case.edu> wrote:
>
>> On 7/17/23 1:03 AM, Peng Yu wrote:
>> > Hi,
>> >
>> > I see the following change in the behavior of [[ -v x[@] ]]. Why is
>> > there such a change?
>>
>> It sometimes helps to follow along with bug-bash discussions.
>>
>> https://lists.gnu.org/archive/html/bug-bash/2021-03/msg00059.html
>> https://lists.gnu.org/archive/html/bug-bash/2021-04/msg00058.html
>>
>> > What is the most efficient way to test whether an associated array is
>> > empty, unset or does not exist?
>>
>> There are really only two interesting states: with set elements and
>> without. You can see whether there are any set elements by testing
>> whether ${#a[@]} is greater than 0. If it's 0, there are no set elements.
>>
>
> and a minor content check , there may be args but empty
>
> [[ ${@[*]} ]] ||
> echo no args content
>
actually this code is full fail
sorry , ..
--
>> ``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/
>>
>>
>>