Search notes:

PowerShell: the automatic variable $psItem ($_)

$_ is an alias for $psItem.

The following two pipelines are equivalent:

'foo', 'bar', 'baz' | forEach-object { write-host $_      }
'foo', 'bar', 'baz' | forEach-object { write-host $psItem }

In a pipeline, $_ refers to the object that is received from the last step in the pipeline.

In a catch block, $_ refers to the exception object (whose type is System.Management.Automation.ErrorRecord) that caused the catch block to be invoked.

In a switch statement, $_ is an alias for the object being tested.

See also