How do you check for duplicate values in PowerShell when comparing two arrays?

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To check for duplicate values in PowerShell when comparing two arrays, you can use the Compare-Object cmdlet along with the -IncludeEqual parameter. Here's an example:

$array1 = 1, 2, 3, 4, 5
$array2 = 4, 5, 6, 7, 8

# Compare the two arrays and include equal items
$duplicates = Compare-Object $array1 $array2 -IncludeEqual | Where-Object {$_.SideIndicator -eq '=='}

# Output the duplicate values
$duplicates.InputObject

In this example, the output would be:

4
5

This means that 4 and 5 are the duplicate values between the two arrays.