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[bar/top]
modules-right = brightnessctl

......
......
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[module/brightnessctl]
type = custom/script
exec = ~/.config/polybar/brightnessctl.sh

scroll-up = exec brightnessctl set +5%
scroll-down = exec brightnessctl set 5%-
interval = 0.2

format-prefix = " "
label = %output%
label-foreground = #FFFFFF