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Re: Error in bash documentation for builtin declare

From: Edouard Thiel
Subject: Re: Error in bash documentation for builtin declare
Date: Fri, 6 Nov 2020 17:53:54 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

Le 06/11/2020 à 17:01, Greg Wooledge a écrit :
On Fri, Nov 06, 2020 at 02:07:36PM +0100, Edouard Thiel wrote:
there is an error in the bash documentation:

In the 'declare' builtin, option '-n',  last sentence:
     "The nameref attribute cannot be applied to array variables"
is actually wrong: it can be applied to indexed and associative arrays
(since bash 4.3+)

(tested for bash version : 4.3.48(1)-release (x86_64-pc-linux-gnu))
The relevant section in the 5.0 man page under PARAMETERS says:

   Array variables cannot be given the nameref attribute.  However,
   nameref variables can  reference  array  variables and  subscripted
   array  variables.

What, exactly, did you test?
This is more clear, and in fact, ok for me (if subscripted means associative?);
the link above is not up to date.

By the way, I have seen that the nameref works more or less for functions:
$ foo() { echo "hello" ;}
$ declare -n bar=foo
but the reference has to be dereferenced when calling:
$ ${!bar}

is it still the case in bash 5?

Cheers, Edouard


Professeur Edouard THIEL                  http://j.mp/ethiel
Département Informatique et Interactions  http://j.mp/dept-ii
UFR Sciences, Aix-Marseille Université    http://j.mp/fs-amu
Laboratoire d'Informatique et Systèmes    http://j.mp/lis-amu

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