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This question already has an answer here:

Here is my interesting situation. I have a Linux Mint installation (Gnome), over which I installed Compiz Fusion because that is how I used to do things in the past. At some point Gnome broke, didn't have time to investigate so I put xfce on top. Total mambo jumbo, but I don't have time now to fix it properly. I now want to rebind Ctrl+Alt+L, but I don't even know which app picks it up.

My question is: what debugging tool should I use to figure out which application receives my keybind? Is there a central dispatcher in Linux? Is there at least a log I can read? Thank you!

marked as duplicate by don_crissti, Christopher, Kiwy, roaima, Kusalananda Mar 23 '18 at 10:29

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You can run grep '<Primary><Alt>l' ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml to see what is using it. All keyboard shortcuts for Xfce are stored in that file. They correspond to the shortcuts in Keyboard > Application Shortcuts and in Window Manager > Keyboard. Shortcuts can also be changed in Settings Editor > xfce4-keyboard-shortcuts.

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