更改文件名的bat，桌面创建.txt然后更改后缀名为.bat,复制粘贴进取使用即可
@echo -----------change file prefix---------
@echo off
set before=
set /p before=before suffix:
set after=
set /p after=after suffix:
ren *.%before% *.%after%
原文：https://www.cnblogs.com/Yunrui-blogs/p/14568781.html