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From: Grisha Levit <grishalevit@gmail.com>
Newsgroups: gnu.bash.bug
Subject: Re: test -v and environment variable names with subscripts
Date: Thu, 19 Jul 2018 15:26:53 -0400
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On Thu, Jul 19, 2018 at 2:44 PM konsolebox <konsolebox@gmail.com> wrote:
> On Wed, Jul 18, 2018 at 5:19 AM, Grisha Levit <grishalevit@gmail.com> wrote:
> > $ set -u; unset var; f() { test -v 'var[0]'; echo $?; }; var[0]=X f
> > 0
> > -bash: var[0]: unbound variable
>
> I'm not getting this error.  What version of bash are you using?

Sorry about that, the command should have been:

    set-u; f() { test -v var[0]; echo $?; echo ${var[0]}; }; var[0]=X f