Powershell 脚本删除最旧的文件

Question

我不想“删除超过 X 天的文件”。如果我想这样做，我只需从已经为此目的编写的数千个脚本中选择一个，而且我不会在 ServerFault 上问这么琐碎的问题。

我确实想删除特定文件夹中除最近的 N 个文件之外的所有文件。

我找到了一个可以满足我需求的脚本，但它只在特定文件夹中有效。脚本如下：

# Defines how many files you want to keep?
$Keep = 2

# Specifies file mask
$FileMask = "*.bak"

# Defines base directory path
$Path = "D:\example\"

# Creates a full path plus file mask value
$FullPath = $Path + $FileMask

# Creates an array of all files of a file type within a given folder, reverse sort.
$allFiles = @(Get-ChildItem $FullPath) | SORT Name -descending 

# Checks to see if there is even $Keep files of the given type in the directory.
If ($allFiles.count -gt $Keep) {

    # Creates a new array that specifies the files to delete, a bit ugly but concise.
    $DeleteFiles = $allFiles[$($allFiles.Count - ($allFiles.Count - $Keep))..$allFiles.Count]

    # ForEach loop that goes through the DeleteFile array
    ForEach ($DeleteFile in $DeleteFiles) {

        # Creates a full path and delete file value
        $dFile = $Path + $DeleteFile.Name

        # Deletes the specified file
        Remove-Item $dFile
    }
}

我想知道是否有办法让这个脚本在整个磁盘上运行。例如，它扫描磁盘 D，进入每个子文件夹并删除文件，保留最近的两个文件。只删除文件而不删除文件夹。