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I am trying to monitor my laptop (Debian 8.7) when it is being used by someone else,I want to see what at any time people are running on my system & for this I'm trying to run a terminal command via SSH which captures the screenshot which I can view later.

I am using SSH client named JUICE SSH from my Android phone to login to my laptop but unable to execute any screenshot related commands.

I have tried scrot,gnome-screenshot,import but I'm unable to get the screenshot. The error with scrot says Can't open X display. It *is* running, yeah?

I checked my sshd_config file it had X11Forwarding set to YES searching internet I read that setting it to no should make it work but it did not happened either.

echo $DISPLAY var is :0.0

Ideas please?

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2 Answers 2

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Use the following command to take a screenshot using the android terminal:

DISPLAY=:0.0 import -window root screenshot.png
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  • I tried this but gives me display: unable to open X server ' @ display. /some path/. Commented Apr 25, 2017 at 9:39
  • try this android application play.google.com/store/apps/details?id=org.connectbot Commented Apr 25, 2017 at 9:41
  • is this app dependent thing?I thought some server config problem it was Commented Apr 25, 2017 at 11:10
  • @techie_28 there is my sshd_config pastebin.com/YMSnZRaX Commented Apr 25, 2017 at 11:55
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    Adding "-silent" removes the beeping sound: DISPLAY=:0.0 import -silent -window root screenshot.png Commented Feb 4, 2020 at 16:38
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You need privileges to spy on the screen of another user. Start by listing the access cookies of TARGET_USER:

$ sudo -u TARGET_USER xauth list
[...]
YOURHOST/unix:0  MIT-MAGIC-COOKIE-1  cc9413c4a3db83ef94647cfb2f1c2f4d
[...]

Choose the display you need (for the primary X console it's typically like the above line) and add it to your access list:

$ xauth add YOURHOST/unix:0 . cc9413c4a3db83ef94647cfb2f1c2f4d

(. is an abbreviation of MIT-MAGIC-COOKIE-1). You can then dump the display into a file (:0 is an abbreviation of YOURHOST/unix:0):

$ xwd -display :0 -root -silent -out root0.xwd

or show it directly if you've got your own X display (probably not if you SSH in from an Android system):

$ xwd -display :0 -root -silent | xwud
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