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I'm using a monochrome color theme extension called Desaturate All. Normally I have to click on the icon to toggle, but I want to automate it on startup.
I tried this command (-e, -d) but it doesnt change the screen color, just shows/hides the extension's icon in the taskbar:
gnome-shell-extension-tool -e desaturate_all@nicolas.brack.mail.be