On Tue, 15 May 2018, Jaap Akkerhuis wrote:
Early unixes had dsw: Delete by SWitch register.
Needed because the file system was then so !@#›%-up that "rm" wouldn't
work, so the i-number had to be keyed in.
It was also known as Delete Sh*t Work :-)
I think that "clri" was written shortly thereafterwards; I have a paper on
its use somewhere in the archives, from around the 70-80s.
-- Dave