On Mon, 15 Mar 2021 20:36:28 -0700
Marc Shapiro via Dng <dng@???> wrote:

> I'm not familiar with sfill.  What does it do and what package is it
> in.  It is not currently installed here.
>
> Marc

sfill is part of secure-delete. rm doesn't actually remove data, it
just remove all links to it leaving the space available to be used by
something else. secure-delete scramble the data with junk (several
times) so nothing can be recovered.