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Run xprop _NET_WM_PID or xdotool selectwindow getwindowpid from a terminal then click on a window to see the process ID of the process that owns that window. (This works often but not always, see What process created this X11 window? for caveats.) One you have the process ID (e.g. 1234), ps -p 1234 -o args or ls -l /proc/1234/exe tells you what command the ...

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