password program help

I'm trying to write a password program and it just won't work

correctPassword = "shadow"
write ("please enter password:")
password = read()
If password == correctPassword Then
	  print("correct!")
	  redstone.setOutput("left", true)
	  sleep(5)
	  os.shutdown
else
	  print("incorrect")
	  sleep(5)
	  os.shutdown
end

I am getting a '=' expected error on line 4 (the if statement line). I tried searching for various fixes but nothing seemed to work. Any help would be appreciated :P/>/>

if with non capital i. then with non capital t

btw, it's

 os.shutdown()

thanks that did the trick

LUA is very case-sensitive :/