powershell获取mac地址
> getmac
> getmac | select-string "00"
> $a = getmac | select-string "00"
> $a
>-split $a | select-string "00"
> getmac
> getmac | select-string "00"
> $a = getmac | select-string "00"
> $a
>-split $a | select-string "00"