11:14:44.18 x:\>powershell
Windows PowerShell
Copyright (C) 2006 Microsoft Corporation. All rights reserved.

PS x:\> ?

cmdlet ? at command pipeline position 1
Supply values for the following parameters:
FilterScript:
Where-Object : Cannot bind parameter 'FilterScript'. Cannot convert value "" to
type "System.Management.Automation.ScriptBlock". Error: "从“System.String”到
“System.Management.Automation.ScriptBlock”的强制转换无效。"
At line:1 char:1
+ ? <<<<
PS x:\>


——就是反应有点慢，一个命令下去，2、3秒钟才反应过来