PowerShell – Check For Matching Items In Seperate Arrays

$test1 = (1,2,3)
$test2 = (2,4,6)
$test3 = (1,3,5)
( ( $test1 + $test2 + $test3) | Group-Object |?{$_.Count -gt 1}).Values

Example outputs:

PS C:\> $test1 = (1,2,3)
$test2 = (2,4,6)
$test3 = (1,3,5)
( ( $test1 + $test2 + $test3) | Group-Object |?{$_.Count -gt 1}).Values
1
2
3
PS C:\>  

PowerShell Special Characters and Tokens (short-handing):
http://www.neolisk.com/techblog/powershell-specialcharactersandtokens

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