First of all, sorry for my English. I'm trying to add an icon in the gnome-shell's dock (with Ubuntu 13.04 and 13.10) for the command line app xkill, but it doesn't work, since it is a terminal ...
The dialog that appears when I press Alt+F2 froze (what is it called? minicli?), I then proceeded to kill it by clicking it after running the command xkill, this was the message: xkill: killing ...