CMD - 等待并行命令行完成？

Question

我通过命令行(win7 cmd)并行执行4个任务:

start defrag /A c:
start defrag /A d:
start defrag /A e:
start  defrag /A f:
dir 

但是,该dir命令在第一行之后执行.

我希望在dir完成所有4个命令后执行该命令.

我该怎么做 ？

Answer 1

试试这个:

start defrag /A c:
start defrag /A d:
start defrag /A e:
start defrag /A f:

:StartLoop
:: Check whether any of the defrags are running...
tasklist|Findstr /i /c:"defrag"
:: Exiting the loop if tasklist didn't find any defrags.
If %errorlevel% NEQ 0 (
   GoTo :ExitLoop
)
choice /T 10 /D Y /M "Waiting for 10 seconds..."
GoTo :StartLoop
:ExitLoop
dir