To go in may batch mode or prompt mode or just windows prompt mode ? If i do it in windows prompt i get errors and if i do it in maya prompt does not find the file ...
oops.. I forgot that doblur is a mel command.. I think your source images have to be in one of the image directories of your current maya project...like the images folder.. the same applies to commands like makebot etc..
a BOT file is optimized for large textures so that the renderer only loads what it needs to render and is therefore more effecient with limited amounts of ram