История изменений

#!/bin/bash
backlight=/sys/class/backlight/intel_backlight
light=$(cat $backlight/brightness)
if [ $1 = "up" ]
then
  s="+"
fi
if [ $1 = "do" ]
then
  s="-"
fi
let " newlight = light $s 75 "
if [ $newlight -le "937" ] && [ $newlight -ge "37" ]
then
  echo "$newlight" > $backlight/brightness
else
  if [ $newlight -lt "37" ]
  then
    echo "37" > $backlight/brightness
  else
    echo "937" > $backlight/brightness
  fi
fi