# blender -P cube.txt
# cube_example.py
# I use blender 2.73a, on debian 6.
# This script works.

import bpy

# Add a cube at the origin.
bpy.ops.mesh.primitive_cube_add()
# info window interpets this as bpy.ops.mesh.primitive_cube_add(radius=1, view_align=False, enter_editmode=False, location=(0, 0, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))

# Add another cube at a different location.
bpy.ops.mesh.primitive_cube_add(location = (0, 4, 0))
# info window interpets this as bpy.ops.mesh.primitive_cube_add(radius=1, view_align=False, enter_editmode=False, location=(0, 4, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))

bpy.data.scenes['Scene'].render.filepath = 'cube.png'
bpy.ops.render.render( write_still=True )