local function find_files(dir)
 local files = {}
 for filename in lfs.dir(dir) do
  local fullpath = dir .. filename
  if lfs.attributes(fullpath, "mode") == "directory" then
   table.insert(files, fullpath)
   for f in find_files(fullpath .. "/") do
    table.insert(files, f)
   end
  elseif filename:match("%.lua$") then
   table.insert(files, fullpath)
  end
 end
 return files
end

local files = find_files("startbg/")

for i, file in ipairs(files) do
 print(file)
end