根据这些有用的注解，我相信这就是你要找的，假设我们将示例输入存储在一个名为CSV的变量中：

$csv = ConvertFrom-Csv @'
By,Mode,File
user1,Read,creation\1. ABC
user1,Read,creation\1. ABC\Invoice
user1,Read,creation\1. ABC\LIMITED
user2,Read,edition\File
user2,Read,edition\File\DATA SHEETS
user2,Read,BCD
user2,Read,BCD\DATA
user3,Read,BCD
'@

我们可以使用Group-Object、Sort-Object和String.StartsWith的组合：

# group the objects by the `By` property and enumerate them
$csv | Group-Object By | ForEach-Object {
    # sort the groups by the `File` property (ascending)
    $sorted = @($_.Group | Sort-Object File)
    # and enumerate each group
    for($i = 0; $i -lt $sorted.Count; $i++) {
        # store the current item
        $current = $sorted[$i]
        # and the next item in this collection
        $next = $sorted[$i + 1]
        # if there is a next item in this group AND
        # the next item `File` property starts with the same string as the current item
        # i.e.: `'edition\File\DATA SHEETS'.StartsWith('edition\File')`
        if($next -and $next.File.StartsWith($current.File, [StringComparison]::InvariantCultureIgnoreCase)) {
            # we can assume this one can be skipped
            continue
        }
        # else, output it
        $current
    }
}

从这个例子中产生的输出将是：

By    Mode File
--    ---- ----
user1 Read creation\1. ABC\Invoice
user1 Read creation\1. ABC\LIMITED
user2 Read BCD\DATA
user2 Read edition\File\DATA SHEETS
user3 Read BCD