Command-line rendering batch of PNG images from obj+mtl file - python

I am trying to command-line rendering an PNG file from obj+mtl file instead of using blender.
Currently, I'm using blender to load the obj+mtl file, and then use the render feature of Blender. But, that requires GUI to do so.
I need to render a batch of PNG files with different textures on the same obj on a server.
How should I do that?
Thank you very much!

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