On Mon, Apr 17, 2023 at 10:23:17AM -0700, Wiley Young wrote: > Description: > When an array 'a_foo' is created with 'mapfile -d '' -t', it is > tested with '[[ -v a_foo ]]' and '[[' returns 0. When '-O 1' is added to > mapfile, '[[ -v a_foo ]]' returns non-0.
It's not specifically the -O1 option. It's the fact that there's no element 0. unicorn:~$ unset a unicorn:~$ a[1]=foo unicorn:~$ [[ -v a ]]; echo "$?" 1 I believe [[ -v a ]] is equivalent to [[ -v a[0] ]]. I have never yet seen a justifiable reason to use [[ -v ]]. All I've ever seen come out of it are bugs and confusion.
