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Re: ${!variable@operator} does not work for variables without values; i


From: Chet Ramey
Subject: Re: ${!variable@operator} does not work for variables without values; inconsistencies between present and absent [@] for @A and @a
Date: Thu, 20 Feb 2020 13:59:14 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 2/19/20 4:03 PM, Arfrever Frehtes Taifersar Arahesis wrote:
> ${!variable@operator} does not work for variables without values.
> See empty values for all occurrences of ${!var@...} below.

I think you already realized that your test for this case was flawed.
For instance, given

var=VAR2
operator=Q

eval "echo \"'\${!${var}@${operator}}'\""

you end up expanding ${!VAR2@Q}.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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