../infix_to_postfix < teapot.math > teapot.postfix

../math_string_to_stl -1 1 -1 1 -1 1 .03 2 < teapot.postfix > teapot.stl

 ../math_string_slice_to_ppm -2 2 -2 2 0 0.05 < teapot.postfix > teapot.ppm

 ../math_string_slice_to_ppm 1 2.3 1 2.3 -.005 0.005 < thinnerclient.postfix > thinner_client.ppm
 pnmtopng < thinner_client.ppm > thinner_client.png
Note: I couldn't get piping directly to pnmtopng to work --- some assertion fails.

../math_string_slice_to_toolpath 1 2.3 1 2.3 -.005 0.005 0.0075 < thinnerclient.postfix > thinner_client.toolpath

../stl_to_ppm  --pitch 0.7 < teapot.stl | pnmtojpeg > teapot_image.jpg