echo $id #id="asdfsadf HDMI-1.1 asdfsdfas sfdsa" id=$(xrandr) id="HDMI${id#*HDMI}" #remove prefix to "HDMI" this does the # the * signifies what to remove id="${id%%[[:space:]]*}" echo $id "On" id2=$(xrandr) id2="eDP${id2#*eDP}" id2="${id2%%[[:space:]]*}" echo $id2 "Off" xrandr --output $id2 --off xrandr --output $id --auto