Lists screen brightness options or sets it to the brightness defined by: q:; e. g. screen brightness 50 would dim the screen to 50% maximum brightness
Taispeáin na roghanna ghile an scáileáin nó socraigh é go dtí an ghile: q:; m. sh. má roghnaíonn tú gile 50, socrófar gile an scáileáin go dtí 50% den ghile is mó