[文件操作] 请教批处理FOR的循环嵌套如何把文件名小写字母改成大写字母？

@echo off
setlocal enabledelayedexpansion
for %%i in (*.*) do (
	set a=%%i
	set c=%%~xi
	set b=%%~ni
	if !c! neq ^.bat ( 
	call :aa !b!
	
	)
)
pause
:aa
setlocal enabledelayedexpansion
for %%l in (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) do (

	set d=!!b:%%l=%%l!!
	
)
echo !!d!!
复制代码

@echo off
set "up=A B C D E F G H I J K L M N O P Q R S T U V W X Y Z"
setlocal enabledelayedexpansion
for %%i in (*.*) do (
	set "b=%%~ni"
	set "a=%%~xi" 
	for %%a in (!up!) do (
		set "b=!b:%%a=%%a!"
	)
	if !a! neq ^.bat (
		ren %%i !b!!a!
	)
)
pause
复制代码