[ubuntu] Zenity Prank Fail - Gtk-WARNING **: cannot open display

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http://ubuntuforums.org – I wanted to play a prank on my sister it didn't work and I thought I'd just ask why not. On my local machine I type Code: find / | zenity --progress --pulsate --text "Erasing hard drive - please wait" it works, and I get a pulsating dialogue box, the hard drive is using "Find" and so it's going wild, as if it's being erased... "Okay, good" I think so I ssh to my sisters machine and login as her I know that from ssh I will need to provide the DISPLAY command also, so I do Code: DISPLAY=:0 find / | zenity --progress --pulsate --text "Erasing hard d (Hardware)