[solved - properly this time] Processing Command Line Arguments

local arg = {...}
--set vaiables to default, we will overide these with the arg later
local quadProgram = defaults.quadProgram
local numOfQuads = defaults.numOfQuads
local delayMult = defaults.delayMult
local ignoreRedstone = defaults.ignoreRedstone
local anyKeyTerminate = defaults.anyKeyTerminate
local bSide = defaults.bSide
local rSide = defaults.rSide

--lower case everything
for i = 1, #arg do
  if tostring(arg[i]) then
	arg[i] = string.lower(arg[i])
  end
end
--process arg
for i = 1, #arg do
  if arg[i] == "-h" then
	printUsage()
  elseif arg[i] == "-f" then --quadProgram
	do --make my editor look clearer
	myError("arg "..i.." Can't load file", 2)
	i = i + 1 --this is definatly really bad practise
	end --make my editor look clearer
  elseif arg[i] == "-n" then --numOfQuads
	do --make my editor look clearer
	local n = tonumber(arg[i+1])
	if n == nil or n < 1 then
	  myError("arg "..i.." -n arg must be followed by a whole number greater than 0 (1 or greater are valid)", 2)
	else
	  local a,b = math.modf(n)
	  if b ~= 0 then
		myError("arg "..i.." -n arg must be followed by a whole number greater than 0 (1 or greater are valid)", 2)
	  end
	end
	if n > 64 then
	  print("arg "..i.." Warning: numOfQuads is larger than one stack(64). Did the max per base change or are you piping them in?")
	end
	numOfQuads = n
	i = i + 1 --this is definatly really bad practise
	end --make my editor look clearer
  elseif arg[i] == "-d" then --delayMult
	do --make my editor look clearer
	local d = tonumber(arg[i+1])
	if d == nil then
	  myError("arg "..i.." -d arg must be followed by a number", 2)
	end
	delayMult = d
	i = i + 1 --this is definatly really bad practise
	end --make my editor look clearer
  elseif arg[i] == "-r" then --redstoneSide
	do --make my editor look clearer
	local r = tostring(arg[i+1])
	if r == nil then
	 myError("arg "..i.." -r arg must be followed by a string representing a side or equal to 'ignore'", 2)
	end
	if r == "ignore" then
	  ignoreRedstone = true
	elseif r == "left" or r == "right" or r == "front" or r == "back" then
	  rSide = r
	  ignoreRedstone  = false
	else
	  myError("arg "..i.." -r arg must be followed by a string representing a side or equal to 'ignore'", 2)
	end
	i = i + 1 --this is definatly really bad practise
	end --make my editor look clearer
  elseif arg[i] == "-b" then --baseSide
	do --make my editor look clearer
	local b = tostring(arg[i+1])
	if b == nil then
	  myError("arg "..i.." -b arg must be followed by a string representing a side", 2)
	end
	if b == "left" or b == "right" or b == "front" or b == "back" then
	  bSide = r
	else
	  myError("arg "..i.." -b arg must be followed by a string representing a side", 2)
	end
	i = i + 1 --this is definatly really bad practise
	end --make my editor look clearer
  elseif arg[i] == "-t" then --anyKeyTerminate
	do --make my editor look clearer
	local t = tostring(arg[i+1])
	if t == nil then
	  nyError("arg "..i.." -t arg must be followed by a string equal to 'true' or 'false'", 2)
	end
	if t == "true" then
	  anyKeyTerminate = true
	elseif t == "false" then
	  anyKeyTerminate = false
	else
	  myError("arg "..i.." -t arg must be followed by a string equal to 'true' or 'false'", 2)
	end
	i = i + 1 --this is definatly really bad practise
	end --make my editor look clearer
  else
	myError("arg "..i.." unprocessed arg",2)
  end
end