What does $_ mean in PowerShell?

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This is the variable for the current value in the pipe line, which is called $PSItem in Powershell 3 and newer. 

1,2,3 | %{ write-host $_ }

or

1,2,3 | %{ write-host $PSItem }

For example in the above code the %{} block is called for every value in the array. The $_ or $PSItem variable will contain the current value.

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