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Based on answer of KamilCuk, its possible to output on follow way the line which is including the number of the active desktop:
nr_of_active_desktop=activedesktop=$(wmctrl -d | grep "*" | rev | cut -d ' ' -f1)
echo $nr_of_active_desktop
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solved How can I query the number of the virtual desktop on which the bash script is running in Linux Mint via bash?