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


From: Eli Schwartz
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 15:20:20 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.2

On 2/19/20 7:46 PM, Arfrever Frehtes Taifersar Arahesis wrote:
> Eli Schwartz <address@hidden> 2020-02-20 23:49 UTC:
>> Your examples are all (still) broken.
> 
> This would affect only 10 examples from 120, so only 8.33 % of
> examples, far from all examples.

[...]

> Majority (3 of 4) of bugs reported by me in this thread are unaffected
> by above discussion about ${!...} and are certainly still valid.

But your examples are founded in a misunderstanding of how bash
variables work, why should I expend the mental bandwidth to unroll your
micro-optimized for loop full of eval to figure out which examples are
valid?

You've immediately jumped from "I don't get the result I expected" to
"there's a bug in bash". I've pointed out that there are gaps in your
understanding of how bash works. Maybe it's time to revisit your initial
assumptions going in, open yourself up to the possibility that you might
be wrong, rather than bash, and finally, please, *please* just elaborate
your test cases in a readable manner without making them conditional on
correct use of eval. Then we could all discuss whether a specific bit of
behavior makes sense.

-- 
Eli Schwartz
Arch Linux Bug Wrangler and Trusted User

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