文件统一添加后缀 a 和文件夹统一添加后缀 a

::文件统一添加后缀 a
@echo off
set a=_done
setlocal EnableDelayedExpansion
for %%n in (*.txt) do (
set /A a
ren "%%n" "%%n!a!.txt"
)

::文件夹统一添加后缀 a
set a=_done
setlocal EnableDelayedExpansion
FOR /f "tokens=*" %%i IN ('dir /a:d /b') DO (
set /A a
ren "%%i" "%%i!a!"
)