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Seems like every year there's a new scripting language of the week - python, Lua, Perl etc etc, but real hackers know that what holds the pipeline together is shell script - so lets have a RM binding for shell script!!!!
It turns out that with some minor sleight of hand, RIB files can be shell scripts too, so you can just run your rib files - embed shell in your ribor rib in your sh! it's all the same.
From there it's small stupid step to implement the whole rendering pipeline in shell script!! Rensh is a basic RenderMan compatable renderer written totally in shell script (with a little help from bc). It can handle all of the quadrics, and patches (including basis conversion). Of course the output is ASCII.
This technique was presented as a Stupid RenderMan Trick at the Pixar user group meeting in Los Angeles, August 2008.