Chown ???

[Alan Cox]

> I was at BTL in the very early '80s.  Writing kernel mods and drivers
> for Unix, and teaching Unix internals to BTL employees.  It's always been
> "superuser".  I don't know where anyone got this lame "substitute user"
> stuff, but it's not authentic.

To quote the V7 manual page

-su  \-  substitute user id temporarily


So although a lot of people believe su is superuser, they are wrong. 

Alan