:q! to get out of vim/etc directory means configuration filessddm.conf.d means "SDDM Configuration Directory". SDDM is the name of your login screen:q!sudo bash -c 'printf "[Theme]\nCursorSize=48" > /etc/sddm.conf.d/kde_settings.conf'[Theme]
CursorSize=48/etcsddm.conf.d