[文本处理] 请问在windows批处理中如何将两个路径接接？

@echo off &setlocal enabledelayedexpansion
set aaa="1234567890"
set bbb="aa\tt\789"
for %%a in (!bbb!) do set "b=%%~nxa"&set "bb=!bbb:%%~nxa=!"
for %%a in (!b!) do for /f tokens^=1^delims^=^/^" %%b in ("!aaa:%%~a=/!") do echo,!bb:"=!%%b
endlocal&pause&exit/b
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@echo off
set "aaa=1234567890"
set "bbb=aa\tt\789"
setlocal enabledelayedexpansion
for /f "delims=" %%i in ("%bbb%") do (
    for /f "delims=<" %%j in ("!aaa:%%~nxi=<!") do (
        set "b=%%i"
        echo,!b:%%~nxi=!%%j
    )
)
pause
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@echo off
set "aaa=1234567890"
set "bbb=aa\tt\789"
for %%i in ("%bbb%") do (
    for /f "delims=" %%j in ('powershell -c "'%aaa%'.split('%%~nxi')[0]"') do (
        for /f "delims=" %%k in ('powershell -c "'%bbb%' -replace '[^\\]*$'"') do (
            set "NewStr=%%k%%j"
        )
    )
)
echo,%NewStr%
pause
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