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From: Greg Wooledge <wooledg@eeg.ccf.org>
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Subject: Re: GNU Bash v.4.4.23-5 built-in function 'set' produces variable outputs
Date: Tue, 23 Oct 2018 08:25:01 -0400
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On Tue, Oct 23, 2018 at 02:06:37PM +0700, Robert Elz wrote:
> Interactively you're much more
> likely to want !$ than $_ (I'd suggest infinitely more lijkely...)

You mean negative infinity.

wooledg:~$ grep histexpand .bashrc
set +o histexpand