This code is a copy and modification of this repo: https://github.com/caseyscarborough/keylogger As an experiment to see what keys I most frequently type, I copied the above repo and modified it for my specific usage.
$ export SDKROOT="/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk"
$ makeThe application by default logs to ./keystroke.log and ./words.log
$ keylogger
Logging to: keystroke.log and words.log