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Re: test -v for array does not work as documented

From: Ulrich Mueller
Subject: Re: test -v for array does not work as documented
Date: Wed, 19 Feb 2020 17:18:14 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.60 (gnu/linux)

>>>>> 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.

So, is there any syntax that allows to test if a value has been assigned
to the array variable? Especially, to distinguish VARNAME=() (empty
array) from VARNAME being unset?

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