I want to render a scene with all the renderman shaders that are in a
determinate folder.
Something like that: renderdl scene.rib changeshader "plastic" "/
folder/*.sdl"
In each render only one new renderman shader must be applied, the rest
of shaders will be the default.
In that way after some time rendering your computer you can see all
the images of all your shaders with a image viewer.