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Re: What has been changed in [[ -v x[@] ]]?
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From: |
Chet Ramey |
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Subject: |
Re: What has been changed in [[ -v x[@] ]]? |
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Date: |
Mon, 17 Jul 2023 12:21:31 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 |
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.
--
``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/