diff --git a/shell/light b/shell/light
new file mode 100755
index 0000000..9ecb57b
--- /dev/null
+++ b/shell/light
@@ -0,0 +1,78 @@
+#!/bin/bash
+
+FILE=""
+CURLIGHT=`xbacklight | cut -d '.' -f1`
+
+echo $CURLIGHT
+
+echo $(($CURLIGHT +10))
+
+
+if [ "$1" = "+" ] ;
+then
+	if [ $CURLIGHT -ge 0 ] && [ $CURLIGHT -lt 10 ]
+	then 
+		xbacklight =20
+	elif [ $CURLIGHT -gt 9 ] && [ $CURLIGHT -lt 20 ]
+	then
+		xbacklight =30
+	elif [ $CURLIGHT -gt 19 ] && [ $CURLIGHT -lt 30 ]
+	then
+		xbacklight =40
+	elif [ $CURLIGHT -gt 29 ] && [ $CURLIGHT -lt 40 ]
+	then
+		xbacklight =50
+	elif [ $CURLIGHT -gt 39 ] && [ $CURLIGHT -lt 50 ]
+	then
+		xbacklight =60
+	elif [ $CURLIGHT -gt 49 ] && [ $CURLIGHT -lt 60 ]
+	then
+		xbacklight =70
+	elif [ $CURLIGHT -gt 59 ] && [ $CURLIGHT -lt 70 ]
+	then
+		xbacklight =80
+	elif [ $CURLIGHT -gt 69 ] && [ $CURLIGHT -lt 80 ]
+	then
+		xbacklight =90
+	elif [ $CURLIGHT -gt 79 ] && [ $CURLIGHT -lt 90 ]
+	then
+		xbacklight =100
+	else
+		xbacklight =100
+	fi
+elif [ "$1" = "-" ] ;
+then 
+	if [ $CURLIGHT -ge 0 ] && [ $CURLIGHT -lt 10 ]
+	then 
+		xbacklight =0
+	elif [ $CURLIGHT -gt 9 ] && [ $CURLIGHT -lt 20 ]
+	then
+		xbacklight =10
+	elif [ $CURLIGHT -gt 19 ] && [ $CURLIGHT -lt 30 ]
+	then
+		xbacklight =20
+	elif [ $CURLIGHT -gt 29 ] && [ $CURLIGHT -lt 40 ]
+	then
+		xbacklight =30
+	elif [ $CURLIGHT -gt 39 ] && [ $CURLIGHT -lt 50 ]
+	then
+		xbacklight =40
+	elif [ $CURLIGHT -gt 49 ] && [ $CURLIGHT -lt 60 ]
+	then
+		xbacklight =50
+	elif [ $CURLIGHT -gt 59 ] && [ $CURLIGHT -lt 70 ]
+	then
+		xbacklight =60
+	elif [ $CURLIGHT -gt 69 ] && [ $CURLIGHT -lt 80 ]
+	then
+		xbacklight =70
+	elif [ $CURLIGHT -gt 79 ] && [ $CURLIGHT -lt 90 ]
+	then
+		xbacklight =80
+	else
+		xbacklight =90
+	fi
+else
+	echo "Invalid argument. expected '+' or '-'"
+fi
+