PIpelineExample

fileinfo.ps1

function filesystem { 
   param( 
      [Parameter(ParameterSetName="Dirs",ValueFromPipeline)]
      [System.IO.DirectoryInfo]$Directory, 
      
      [Parameter(ParameterSetName="Files",ValueFromPipeline)]
      [System.IO.FileInfo]$File
   )
   process {
      switch ($PSCmdlet.ParameterSetName) {
         "Dirs" { "Woot a whole directory!" }
         "Files" { "Awww, it's just a file!" }
      }
   }
}