@echo off & setlocal enabledelayedexpansion
set /p "abspath=U盘绝对路径:"
if not defined abspath goto :eof
if not exist "!abspath!" goto :eof
if not "!abspath:~-1!"=="\" set "abspath=!abspath!\"
call :pathlen
for /r "%abspath:~0,2%" %%i in (.) do (
    setlocal
    set "_abspath=%%i" & set "_abspath=!_abspath:~0,-1!"
    call :getrelpath "!_abspath!"
    for /f "tokens=1* delims=\" %%q in ("!abspath!") do set "rel=!rel:~3!%%r"
    if /i "!_abspath:~0,%pathlen%!"=="!abspath!" set rel=!_abspath:~%pathlen%!
    echo !_abspath! ---^> !rel!
    endlocal
)
pause>nul
goto :eof

:getrelpath
for /f "tokens=1* delims=\" %%i in ("%~1") do (
    set rel=..\!rel!
    call :getrelpath "%%j"
)
goto :eof

:pathlen
for /l %%i in (0 1 100) do if "!abspath:~%%i,1!"=="" set "pathlen=%%i" & goto :eof
goto :eof
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