XScreendump

If you have sshd installed, you can display a snapshot of the Joggler screen on your own display with

ssh @ "xwd -root -display :0" | xwud

(That is : on the joggler run the cmd xwd for the root window of the local display, passing the result back in a stream to the user's system and displaying it with the xwud renderer). Xwd is already installed in the joggler default system.

To actually save the screenshot on a Linux machine, use:

ssh @ "xwd -root -display :0" | convert xwd:- /home/ / .png