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以我的判断 这样处理不知可行不

@Echo Off&SetLocal EnableDelayedExpansion
For /F "tokens=*" %%i IN (1.txt) Do (
    set "str=%%i"
    if "!str:~,1!" equ "\" (
       if defined var (echo !var!&set var=&echo %%i) ELSE echo %%i
    ) else set var=%%i
)
pause
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