That is a Switch parameter, indicating that it does not require any input. After you specify the Recurse parameter, PowerShell Get-Childitem returns all items in the specified locations. As well as that, the Cmdlet also returns all child items with the places. It takes advantage of the "dir" alias with https://get-childitempowershell46665.timeblog.net/61112948/top-guidelines-of-get-childitem-powershell