Screen Share Monitor

Download a prebuilt installer package for Screen.Share.Monitor.1.0.pkg below

The installer package will install the following files:

/Library/Application Support/ScreenShareNotifier/screenshare-notifier.sh   
/Library/Application Support/ScreenShareNotifier/screenshare-monitor.sh   
/Library/Application Support/ScreenShareNotifier/screenshare-notifier.app   
/Library/LaunchAgents/com.mm2270.screensharenotifier.plist   
/Library/LaunchDaemons/com.mm2270.screensharemon.plist

The postinstall script in the package will do the following:

1. Confirm the LaunchDaemon was installed and activate it
2. Confirm the LaunchAgent was installed and activate it as the logged in user, or exit if the Mac is at the login screen.

screenshare-monitor.app

The custom built terminal-notifier that can be used with the Screen Share Monitor scripts.
Or use your own and modify the screenshare-notifier.sh script accordingly.