我见过提及改进的PowerShell 3.0语法，但还没有示例，它会是什么样子？
答案 0 :(得分：9)
许多常见*-Object cmdlet使用多个参数集来完成简化语法。在V3中看一下这个：
C:\PS> Get-Command Where-Object -Syntax
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] [-EQ] [<CommonParameters>]
Where-Object [-FilterScript] <scriptblock> [-InputObject <psobject>] [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CGT [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CNE [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -LT [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CEQ [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -NE [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -GT [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CLT [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -GE [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CGE [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -LE [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CLE [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -Like [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CLike [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -NotLike [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CNotLike [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -Match [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CMatch [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -NotMatch [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CNotMatch [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -Contains [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CContains [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -NotContains [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CNotContains [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -In [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CIn [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -NotIn [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -CNotIn [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -Is [<CommonParameters>]
Where-Object [-Property] <string> [[-Value] <Object>] [-InputObject <psobject>] -IsNot [<CommonParameters>]
注意：查看新的运营商-NotIn和-In，例如：
C:\PS> 1 -In 1..5
C:\PS> 10 -NotIn 1..5
所以简化的语法对于“常见”的情况很好，但请注意，因为你很容易陷入尖锐的岩石和熔岩，例如：
C:\PS> Get-ChildItem | Where LastWriteTime.Year -eq 2010
这什么都不返回，更糟糕的是，没有错误，所以你认为结果集“正确”为空，实际上这个语法实际上并不像你期望的那样工作。也就是说，您无法访问属性的属性。在上文中，PowerShell查找名为LastWriteTime.Year的属性，该属性不存在。
另请注意，作为简化语法的一部分，您现在可以使用$PSItem代替$_，以防您或您编写脚本的人对$_产生某种过敏反应。 ： - ）
虽然这不一定与简化语法有关，但我发现它简化了我的生活，我喜欢它：
C:\PS> Get-ChildItem -Directory
C:\PS> Get-ChildItem -File
C:\PS> dir -ad
C:\PS> Get-ChildItem -Attributes System+Hidden+Directory+!Archive
答案 1 :(得分：7)
以下是一个例子：
dir | where length -lt 10
在3.0之前，它本来是
dir | where {$_.length -lt 10}
编辑：另一个例子，这次使用foreach-object
dir | foreach-object length
答案 2 :(得分：5)
Powershell已经有了非常干净的语法，因此没有太多需要改进的地方。
我喜欢的一个新增加的是Hash Table as objects，您可以通过传递hastable及其属性来创建对象：
[<ClassName>]$Variable = @{<Property>=<Value>;<Property>=<Value>}
因此，更简洁，更简洁的创建自定义对象的方法是：
$obj = [PSCustomObject]@{a=1; b=2; c=3; d=4}
重定向已得到加强。除了正常（管道）和错误之外，您现在还拥有详细，调试和警告的流，因此您可以执行重定向，例如5>&1
您可以使用$PSDefaultParameterValues首选项变量为cmdlet设置默认参数值。
有新的[ordered]加速器来创建有序的hastable（字典）：
$a = [ordered]@{a=1;b=2;d=3;c=4}
在SO的另一个答案中，我意识到-in在Powershell v3.0中是新的：
所以你做了类似1 -in 1,2,3的事情。以前我们只有-contains
的cmdlet：
您可以使用Update-Help cmdlet更新帮助。有与Invoke-
WebRequest类似的网络相关cmdlet。您还可以使用ConverTo-JSON和ConvertFrom-JSON cmdlet处理JSON。