local function find_files(dir)
 local files = {}
 local file_list = io.popen("ls -R " .. dir)
 for line in file_list:lines() do
  if line:match("%.lua$") then
   table.insert(files, line)
  end
 end
 file_list:close()
 return files
end

local files = find_files("startbg/")

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