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From: Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups: gnu.bash.bug
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 08:28:59 -0500
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On Thu, Feb 20, 2020 at 01:46:25AM +0100, Arfrever Frehtes Taifersar Arahesis wrote:
> Is there any way for using ${!variable} combined with
> ${variable@operator}

No.