local lfs = require "lfs"
local curPath = "..\\new\\"
local  totalFile = 0

local strFormatContain = "xml_Format.xml"

function attrdir (path)
    for file in lfs.dir(path) do
     local oldName = file
        
        local  a,b = string.find(oldName,strFormatContain)
        local  newName = string.gsub(oldName,strFormatContain,"xml")
        if a ~= nil  then
   
          print(" oldName:  " .. oldName)
          print(" newName:  " .. newName)

           local    result =  os.rename(curPath .. file,curPath .. newName)
          if result then
            totalFile = totalFile + 1
          end

       os.remove(curPath .. file,curPath .. oldName)

       print("\n")        

    end    

   end

end

attrdir (curPath)
print("totalFile: " ,totalFile)