Eruby executable

Does anyone know anything about eruby as an executable(binary) that runs
on linux? I’ve been looking at hosts(there are quite a few more than i
found last time) and one i’m checking out put a binary file in my cgi
bin(in the root of the site called eruby) - and that , apparently, is
what i use for ruby. It is version 1.8 of ruby. Some other interesting
things. All .rb,.rbx file are run as if they were .rhtml. If it aint in
<% here %> its text. Everything is ERuby. Perhaps this is a way to avoid
the shared_space modruby problem. I dont know!

Anyone shed some light on this for me?