On and Off commands OK

pyLED.py

@@ -4,7 +4,7 @@ LED3_PATH = "/sys/class/leds/beaglebone:green:usr3"
 
 def write2LED(fileName, value, path=LED3_PATH):
     """This function writes the passed value to the file in the path"""
-    fo = open(path + filename,"w")
+    fo = open(path + fileName,"w")
     fo.write(value)
     fo.close()
     return
@@ -12,5 +12,24 @@ def write2LED(fileName, value, path=LED3_PATH):
 def removeTrigger():
     write2LED("/trigger", "none")
     return
-
+#Application Begin:
 print("Starting the LED Python Script") 
+if len(sys.argv)!=2:
+    print("Incorrect number of arguments")
+    sys.exit(2)
+
+#More than one argument:
+if sys.argv[1]=="on":
+    print("LED on")
+    removeTrigger()
+    write2LED("/brightness", "1")
+elif sys.argv[1]=="off":
+    print("LED off")
+    removeTrigger()
+    write2LED(fileName="/brightness", value="0")
+else:
+    print("Wrong command")
+
+
+
+print("End of Script")