How to close IPython Notebook properly?

Question

How to close IPython Notebook properly?

Currently, I just close the browser tabs and then use Ctrl+C in the terminal.
Unfortunately, neither e

Answer 1

These commands worked for me:

jupyter notebook list # shows the running notebooks and their port-numbers
                      # (for instance: 8080)
lsof -n -i4TCP:[port-number] # shows PID.
kill -9 [PID] # kill the process.

This answer was adapted from here.