flyinnet9

@echo off
setlocal enabledelayedexpansion
set /p n=输入倒数数字(0-9)，然后回车：
set /a m=n-1
set 前插=(
set 后插=)
for /f "delims=" %%a in ('dir /b /a-d ^|findstr /v "bat$"') do (
set str=%%~na
set str1=!str:~0,-%n%!
set str2=!str:~-%n%,1!
set str3=!str:~-%m%!
echo.old=!str!
echo.new=!str1!!前插!!str2!!后插!!str3!
pause
)
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