tArgs = {...}

numBlocks = tArgs[1]

local function length()
	local digLength = tonumber(numBlocks)
	if digLength < 5 or = 5 then
		printError("Shaft length must be greater than 5")
		return false
	elseif digLength > 5 then
		return digLength
	end
end

local function beginDig( dLength )
	if dLength ~= false then
		print("Digging a "..dLength.." block shaft...")
	end
end

local function dig( dLength2 )
	while x < dLength2 or = dLength2 do
		x = x + 1
		turtle.dig()
		turtle.forward()
		turtle.digUp()
	end
end

length()
beginDig( digLength() )
dig( digLength() )