Trigger Cinnamon shutdown dialog when pressing Alt+F4 and the Desktop has focus

AltF4ShortcutSwitcher.bash

#!/bin/bash

# This script is a small helper script to modify Linux Mint's / Cinnamon's behavior on pressing Alt+F4.
# The current behavior is to close the active window, but do nothing if no window is focused.
# From MS Windows i was used to focusing the Desktop and clicking Alt+F4 to open the computer's shutdown dialog.
# This script restores this functionality.

# Usage:
# - Register the script as a custom keyboard shortcut by opening the Settings applet --> Keyboard and activating the Keyboard shortcuts tab.
# - From there, click "Create own keyboard shortcut", give the shortcut a name (e.g. custom window close), and select this script as the target.
# - Double-click the first key stroke slot of the newly created shortcut and press Alt+F4.
# - You will be warned that Alt+F4 is already assigned to the close window shortcut. Accept the message.

# The script is not compatible with Cinnamon on Wayland.

if [ $(xdotool getactivewindow getwindowpid | ps -q `cat /dev/stdin` -o 'comm=') = 'nemo-desktop' ]; then
    cinnamon-session-quit --power-off
else
    # xdotool's windowclose does not trigger unsaved changes dialogs and forcibly closes the window. wmctrl works better there.
    # xdotool getactivewindow windowclose
    wmctrl -c :ACTIVE:
fi

Script prerequisites:

• xdotool
• wmctrl

(install via sudo apt install xdotool wmctrl)