On 2/19/20 11:18 AM, Ulrich Mueller wrote:
>>>>>> On Wed, 19 Feb 2020, Chet Ramey wrote:
>
>> On 2/19/20 7:00 AM, Ulrich Mueller wrote:
>>> Bash Version: 5.0
>>> Patch Level: 16
>>> Release Status: release
>>>
>>> Description:
>>> The GNU Bash Reference Manual Version 5.0 says about test -v:
>>> '-v VARNAME'
>>> True if the shell variable VARNAME is set (has been
>>> assigned a value).
>>>
>>> However, it doesn't always return true when VARNAME is an
>>> (indexed or associative) array that has been assigned a value.
>
>> If you refer to an array variable without the subscript, it's equivalent
>> to referencing element 0.
>
> That doesn't seem obvious from the documentation for -v.
It's in Arrays:
"Referencing an array variable without a subscript is equivalent to ref-
erencing the array with a subscript of 0."
> So, is there any syntax that allows to test if a value has been assigned
> to the array variable?
[ -v array[@] ]
> Especially, to distinguish VARNAME=() (empty
> array) from VARNAME being unset?
There's little to distinguish them: neither has a subscript that's been
assigned a value.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU [email protected] http://tiswww.cwru.edu/~chet/
