联盟和交叉口PowerShell的？ [英] Union and Intersection in Powershell?

问题描述

我有以下结构对象的数组：

I have an array of objects of the following structure:

structure Disk 
{
  int UID;
  String Computer;
}

一个计算机可能有一大堆的共享磁盘，并且磁盘可能计算机之间共享。
我想找出所有常见的磁盘的所有计算机。
例如，我有计算机A，B和C;磁盘1，2，和3。
磁盘阵列是{1，A}，{1，B}，{2，A}，{2，B}，{2，C}，{3，A}。
我想结果应该是磁盘2，因为它出现在A，B和C.
有没有办法实现这一目标的有效途径？
随着多个foreach循环是可以实现的，但肯定我想一个更好的办法。
我在考虑像交集操作，但在PowerShell中没有发现这一点。

A computer may have a bunch of shared disks, and a disk may be shared among computers. I want to find out all the disks common to all the computers. E.g., I have computer A, B, and C; Disks 1, 2, and 3. The disk array is {1,A}, {1,B}, {2,A},{2,B},{2,C},{3,A}. The result that I want should be the disk 2, because it appears on A, B, and C. Is there a effective way to achieve this? With multiple foreach loops it's achievable, but definitely I want a better way. I'm thinking about operations like intersection, but didn't find this in powershell.

推荐答案

假设 $改编是数组，你可以这样做：

Assuming $arr is the array, you can do like this:

$computers = $arr | select -expand computer -unique
$arr | group uid | ?{$_.count -eq $computers.count} | select name

---

在一般情况下，我将接近并和交在PowerShell中是这样的：

---

In general, I would approach union and intersection in Powershell like this:

$a = (1,2,3,4)
$b = (1,3,4,5)
$a + $b | select -uniq    #union
$a | ?{$b -contains $_}   #intersection

但对于你的要求，上述方案运作良好，并没有真正了解并和交在术语的标准定义。

But for what you are asking, the above solution works well and not really about union and intersection in the standard definition of the terms.

更新：

我已经写 pslinq 提供联盟列表和相交名录这有助于实现集并和交使用PowerShell。

I have written pslinq which provides Union-List and Intersect-List that help to achieve set union and intersection with Powershell.

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