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Is there a way to take a screenshot of what is on screen by being remotely logged on that machine with ssh?
Vnc is no good, since AFAIK it cannot take ownership of an existing X session.

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as the user owning the x11-session you are interested in? – akira Dec 22 '10 at 14:13
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You might want to try this:

xwd -out screenshot.xwd -root -display :0.0

It will save the screenshot to screenshot.xwd which GIMP should be able to open. Check out the xwd man page here: http://linux.die.net/man/1/xwd

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any screenshot program will do: scrot, import (from imagemagick) etc. you just point it to the right $DISPLAY (or -display or --display or --dpy .. thats why i prefer $DISPLAY) and thats it. the main question remains unanswered: wants OP to capture a session (aka spy) on someone else? – akira Dec 23 '10 at 7:27
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