Mavproxy.py location?

Ground Control Software MAVProxy
1

I have MAVProxy on my RPi3 and I used the find command to learn the following

pi@raspberrypi:~ $ sudo find / -iname "mavproxy.py" /usr/local/bin/mavproxy.py /usr/local/lib/python2.7/dist-packages/MAVProxy/mavproxy.py

I want to make mods to mavproxy.py so when I run the mavproxy.py command it also executes another script that gathers sensor data. However, I do not know which mavproxy.py file to modify.

Any input?

Thanks!