text: #!/usr/bin/env python
  
  import sys
  import RPi.GPIO as GPIO
  GPIO.setmode(GPIO.BCM)
  GPIO.setwarnings(False)
  
  red = 12
  green = 20
  blue = 16
  
  GPIO.setup(red, GPIO.OUT)
  GPIO.setup(green, GPIO.OUT)
  GPIO.setup(blue, GPIO.OUT)
  
  if (len(sys.argv) > 1):
      if (sys.argv[1] == "red"):
          GPIO.output(red, 0)
          GPIO.output(green, 1)
          GPIO.output(blue, 1)
  
      elif (sys.argv[1] == "green"):
          GPIO.output(red, 1)
          GPIO.output(green, 0)
          GPIO.output(blue, 1)
  
      elif (sys.argv[1] == "blue"):
          GPIO.output(red, 1)
          GPIO.output(green, 1)
          GPIO.output(blue, 0)
      
      else:
          GPIO.output(red, 1)
          GPIO.output(green, 1)
          GPIO.output(blue, 1)
  
  else:
      GPIO.output(red, 1)
      GPIO.output(green, 1)
      GPIO.output(blue, 1)
  