In Gnome Classic in 14.04, I am running a program (it opens a chm file, but I forgot the name of the program and the window doesn't show the name of the porgram) in a window. It becomes non responsive, and even right clicking it and choosing close don't close it.
How can I find out its pid, and kill it from gnome terminal? Thanks.
xkill
that helps in those single-windows cases.