From: Adriano Ferreira <a.r.ferreira@...>
Date: 2005-03-03T21:56:08+09:00
Subject: Re: Env class bug?

> irb(main):002:0> Etc.getlogin
> => "root"
> Is this expected behaviour? Seems like a bug to me. Am I missing something?

Etc.getlogin likely "implements the C library function of the
same name, which on most systems returns the current login
from /etc/utmp, if any". 

With a 'su' you changed the real user user id and getlogin() returns
the name associated with the current login activity. So as Guy Decoux
said it is the expected behaviour and
        Etc.getpwuid(Process::Sys.geteuid)[:dir]
is what you want.