Sorry for the title, I don't know how to better explain my "problem".
In a nutshell: I would like to open from terminal or win prompt a blender file and see it render on the screen the same way it does when you hit f12, I mean seeing the tiles rendering on screen. The result has to be a windowed UV/Image editor with no bars and menus (did it before as you can see i the code below I called it 'viewport') that let you see the progress of rendering.
Here's my terminal command:
blender /path/to/file.blend -S scene_name -W -p 200 200 800 600 -P /path/to/script.py
Here my script.py content:
bpy.context.window.screen = bpy.data.screens['viewport']
bpy.ops.render.render(animation=False, write_still=True, use_viewport=True, scene="scene_name")
the -S argument is redundant I think, but this isn't a problem.
I need your help, you pros! :-)