local tArgs = { ... }
local nDir = tArgs[1]

if not nDir then
        print("Usage: turn <direction>")
	print("Valid directions: L, R")
	return
end

if nDir == "l" then
	turtle.turnLeft()
	return
end

if nDir == "r" then
	turtle.turnRight()
	return
end

print("You must enter a valid direction.")
print("Valid directions: L, R")