Mesh Smooth / Remesh on Command Line Interface

I’m new to Blender, so my question could be ambiguous.

I need to mesh smooth / remesh / mesh clean up on command line interface.
I read command line part of Blender manual but it seems there’s no option about mesh.
I found similar question via google but I want to ask these just to be sure.

Q1. In this case, do I have to write python script for this purpose?

Q2. If so, can I use that script on MacOS and Windows CLI both?

Many thanks for reading.