从PowerShell阵列中删除重复值

Question

如何从PowerShell阵列中删除重复项？

$a = @(1,2,3,4,5,5,6,7,8,9,0,0)

Answer 1

使用Select-Object例如:

$a = @(1,2,3,4,5,5,6,7,8,9,0,0)
$a = $a | select -Unique

Answer 2

另外一个选项:

$a | sort -unique

Answer 3

如果您想完全防弹，这就是我的建议：

@('Apples', 'Apples ', 'APPLES', 'Banana') | 
    Sort-Object -Property @{Expression={$_.Trim()}} -Unique

输出：

Apples
Banana

这首先使用Property参数来Trim()处理字符串，因此会删除多余的空格，然后仅选择-Unique值。

更多信息Sort-Object：

Get-Help Sort-Object -ShowWindow

Answer 4

$a | sort -unique

这适用于不区分大小写,因此删除具有不同情况的重复字符串.解决了我的问题.

$ServerList = @(
    "FS3",
    "HQ2",
    "hq2"
) | sort -Unique

$ServerList

Answer 5

这就是您如何从具有两个或多个属性的数组中获得唯一性的方法。排序是至关重要的，也是让它正常工作的关键。否则，您只会退回一件商品。

PowerShell 脚本：

$objects = @(
    [PSCustomObject] @{ Message = "1"; MachineName = "1" }
    [PSCustomObject] @{ Message = "2"; MachineName = "1" }
    [PSCustomObject] @{ Message = "3"; MachineName = "1" }
    [PSCustomObject] @{ Message = "4"; MachineName = "1" }
    [PSCustomObject] @{ Message = "5"; MachineName = "1" }
    [PSCustomObject] @{ Message = "1"; MachineName = "2" }
    [PSCustomObject] @{ Message = "2"; MachineName = "2" }
    [PSCustomObject] @{ Message = "3"; MachineName = "2" }
    [PSCustomObject] @{ Message = "4"; MachineName = "2" }
    [PSCustomObject] @{ Message = "5"; MachineName = "2" }
    [PSCustomObject] @{ Message = "1"; MachineName = "1" }
    [PSCustomObject] @{ Message = "2"; MachineName = "1" }
    [PSCustomObject] @{ Message = "3"; MachineName = "1" }
    [PSCustomObject] @{ Message = "4"; MachineName = "1" }
    [PSCustomObject] @{ Message = "5"; MachineName = "1" }
    [PSCustomObject] @{ Message = "1"; MachineName = "2" }
    [PSCustomObject] @{ Message = "2"; MachineName = "2" }
    [PSCustomObject] @{ Message = "3"; MachineName = "2" }
    [PSCustomObject] @{ Message = "4"; MachineName = "2" }
    [PSCustomObject] @{ Message = "5"; MachineName = "2" }
)

Write-Host "Sorted on both properties with -Unique" -ForegroundColor Yellow
$objects | Sort-Object -Property Message,MachineName -Unique | Out-Host

Write-Host "Sorted on just Message with -Unique" -ForegroundColor Yellow
$objects | Sort-Object -Property Message -Unique | Out-Host

Write-Host "Sorted on just MachineName with -Unique" -ForegroundColor Yellow
$objects | Sort-Object -Property MachineName -Unique | Out-Host

输出：

Sorted on both properties with -Unique

Message MachineName
------- -----------
1       1          
1       2          
2       1          
2       2          
3       1          
3       2          
4       1          
4       2          
5       1          
5       2          


Sorted on just Message with -Unique

Message MachineName
------- -----------
1       1          
2       1          
3       1          
4       1          
5       2          


Sorted on just MachineName with -Unique

Message MachineName
------- -----------
1       1          
3       2  

来源： https : //powershell.org/forums/topic/need-to-unique-based-on-multiple-properties/