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From: Robert Elz <kre@munnari.OZ.AU>
Newsgroups: gnu.bash.bug
Subject: Re: GNU Bash v.4.4.23-5 built-in function 'set' produces variable outputs
Date: Tue, 23 Oct 2018 14:08:59 +0700
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ps: I did  not suggest that $_ should go away, I know that's not going to
happen ... just that it would be nice for those who really don't want it to
be able to turn it off.

kre