Do you mean 'rm -rf *'? If so you deleted everything under the folder you were in. 'rm rt*' would only remove filenames beginning in 'rt', which shouldn't be very much/anything.
If it was the former you almost certainly need to reflash. Follow these instructions, and flash both the main image and the emmc http://wiki.maemo.org/Updating_the_t...ng_the_Flasher