批处理添加、替换

##

@echo off
setlocal enabledelayedexpansion
set point=.
for %%i in (*.avi) do (
set "name=%%i"
set a=!name:~0,2!
set b=!name:~2!
set a=!a!%point%
set d=!a!!b!
ren "%%i" "!d!"
)
pause