linux - Linux 亮度脚本在 sigmoid 梯度上递增

Question

我的 Linux 机器上有一个亮度小脚本。目前，当绑定键被按下时，它会减少（减少）一个固定的量。当我接近最大亮度时，如何使这种增加越来越少，反之亦然？越小越好:)

#!/bin/sh


dir="/sys/class/backlight/intel_backlight"

# echo $(( 750 +375 )) > "$dir/brightness"
bright () {
        echo $(($(cat "$dir/brightness") $1 )) > "$dir/brightness"
}

case $1 in
        "") echo "Screen: $(cat /sys/class/backlight/intel_backlight/brightness)" ;;
        +) bright +375 ;;
        -) bright -375 ;;
        +*) bright $1 ;;
        -*) bright $1 ;;
        =)  echo "No value to set passed (0-7500)"  ;; # My machine specific
        =*) echo $1 | sed s/=// > "$dir/brightness" ;;
esac