windows - 无法完成批处理文件

Question

:LOOP    
:: Finds Removable Disk Letter
for /f "tokens=1-3" %%a in ('wmic logicaldisk get caption^, description') do if "%%b %%c"=="Removable Disk" set drive=%%a&goto COPY
:COPY
xcopy %drive% D:\Backup
goto :LOOP

我没有这样的批量经验，我想知道，我该怎么做？: 如果可移动磁盘不存在，不要去 COPY 去 LOOP 吗？

Answer 1

让我们wmic为你做过滤：

:LOOP
for /f %%d in (
  'wmic logicaldisk where description^="Removable Disk" get caption ^| find ":"'
) do (
  xcopy %%d D:\Backup
)
goto LOOP

Answer 2

:LOOP    
:: Finds Removable Disk Letter
for /f "tokens=1-3" %%a in ('wmic logicaldisk get caption^, description') do (
if "%%b %%c"=="Removable Disk" set drive=%%a
if not exist "%%a" goto :LOOP
)
:COPY
xcopy %drive% D:\Backup
goto :LOOP

基本上，如果驱动器不存在，它将返回到:LOOP，如果存在，它将自动下降到:COPY.