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I have connected a projector, but I don't see the image of this second "monitor" very well (it's quite far). Is it possible to get a live preview of this second monitor in a small window on a first monitor? Something like "picture in picture".

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  • Have you come across xwd ? you affectively want to take a screenshot of the other window and display it, but it's not real-time.
    – X Tian
    Commented Aug 23, 2019 at 10:18

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Run 2 programs, in 2 terminals; an x11vnc server and an xvncviewer. E.g.

$ x11vnc -viewonly -clip 1920x1080+1920+0 -scale 0.4

and

$ xvncviewer :0

The x11vnc server sets up a VNC view connection to the indicated screen region of the main display. I've assumed a xinerama set up with the local monitor 1920x1080 to the left and the remote projector 1920x1080 to the right; i.e., the projector is at +1920+0 with display size 1920x1080.

You would change those to suit your actual set up. E.g. 1024x768+1920+0 if the projector has resolution 1024x768 and is (notionally) to the right of the first monitor with resolution 1920x1080.

You may use xrandr to see your actual set up.

I've suggested using xvncviewer as VNC viewer. There are a number of other viewers to choose from.

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