How to Find Duplicate Values in Array in PowerShell

To find duplicate values in an array in PowerShell, you can use the Group-Object cmdlet and filter out the groups with a count greater than 1.

The following method shows how you can do it.

Method 1: Using the Group-Object cmdlet

$numArray = @(10,2,4,2,90,2,5,76,4)

$duplicates = $numArray | Group-Object | Where-Object { $_.Count -gt 1}

Write-Output "Duplicate values in the arrays are: "
$duplicates | Foreach-Object {
      Write-Object $.Name
}

This example will output the duplicate values.

The following example shows how you can do it.

Find Duplicate Values in Array Using PowerShell

You can use the Group-Object cmdlet in PowerShell to group the elements of an array by their values and use Where-Object to filter out duplicate values based on specified criteria.

$numArray = @(10,2,4,2,90,2,5,76,4)

$duplicates = $numArray | Group-Object | Where-Object { $_.Count -gt 1}

Write-Output "Duplicate values in the arrays are: "
$duplicates | Foreach-Object {
      Write-Output $.Name
}

Output:

In this script, the $numArray variable stores the array. It then pipes to the Group-Object cmdlet to group the elements of the $numArray by their values.

The Where-Object cmdlet then filters out the groups with a count greater than 1, which represents the duplicate values.

Finally, the Write-Output cmdlet outputs the duplicate values in an array.

Conclusion

I hope the article on finding the duplicate values in an array is helpful to you.

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