Accessing Blender's Python console from a terminal

bpy_in_terminal.py

'''
If you ever need to install, enable, or debug an add-on that's running on a headless Blender install
(ie, on a server like AWS Deadline), then you can run Blender's Python console from the terminal directly.

This was originally posted here: https://blender.stackexchange.com/questions/73759/install-addons-in-headless-blender, but
I'm saving in a Gist for future me and others.

First, run this in the terminal:
  blender -b --python-console
  
Then, in Python as needed:
'''

import bpy
bpy.ops.preferences.addon_install(filepath='/home/user/testaddon.py')
bpy.ops.preferences.addon_enable(module='testaddon')
bpy.ops.wm.save_userpref()