x11vnc
A VNC server that will enable VNC on an existing display server. tldr-pages
On Linux
Linux
A VNC server that will enable VNC on an existing display server. By default, the server will automatically terminate once all clients disconnect from it.
Launch a VNC server that allows multiple clients to connect
x11vnc -sharedIdentifyLaunch a VNC server in view-only mode, and which won't terminate once the last client disconnects
x11vnc -forever -viewonlyIdentifyLaunch a VNC server on a specific display and screen (both starting at index zero)
x11vnc -display :display.screenIdentifyLaunch a VNC server on the third display's default screen
x11vnc -display :2IdentifyLaunch a VNC server on the first display's second screen
x11vnc -display :0.1Identify