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From: Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups: gnu.bash.bug
Subject: Re: Double substitution issue
Date: Wed, 21 Nov 2018 08:37:33 -0500
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On Tue, Nov 20, 2018 at 08:16:47PM -0800, fulldecent@gmail.com wrote:
> I have found a way to use double expansion, and of course this is not safe 
> in all contexts: 
> 
>     from=1;to=3;eval echo {$from..$to} 

for ((i=from; i<=to; i++)); do
  ...
done.