Getting pid and details for topmost window

Question

Does anyone know how to get the PID of the top active window and then how to get the properties of the window using the PID? I mean properties like process name, program nam

Answer 1

I run this command on a terminal:

sleep 5s; ps -Flwwp $(xdotool getwindowpid $(xdotool getwindowfocus))

Run it, change the focus to the relevant window, wait 5 seconds, then back to terminal. Voilà!