bat修改文件內容

@echo off
(for /f "delims=" %%a in (文件名) do (
  set "str=%%a"
  setlocal enabledelayedexpansion
  set "str=!str:老字符串=新字符串!"
  echo,!str!
  endlocal
))>"setup.tmp"
move /y "tmp.tmp" "文件名"