以下是一种删除我认为可行的行的方法

# earlier in the script

$inFile = Get-Content -Path ".\input.txt"

# ...Later... #

$inFile = Get-Content -path ".\input.txt" | where-object {$_ -notmatch $line}
set-content -path ".\input.txt" -Value $inFile

问题是-NotMatch参数似乎不起作用。Get-Content cmdlet只复制input.txt中的所有内容，包括$line。我还尝试更改代码以完全清除$inFile并创建一个临时持有者，但没有结果。

Clear-Variable -name "inFile"
$holder = Get-Content -path ".\input.txt" | where-object {$_ -notmatch $line}
set-content -path ".\input.txt" -Value $holder
$inFile = Get-Content -path ".\input.txt"

我是不是用错了-Not Match？以下是上下文的全文脚本。

Write-Host "Starting"

[bool] $keepRunning = 1
[bool] $everFound = 0
[bool] $searchComplete = 0
:main while($keepRunning)
{
    $inFile = Get-Content -path ".\input.txt"
    $completed = Get-Content -Path ".\output.txt"
    $line = $inFile[0]
    $holder
    if($inFile.count -eq 1)
    {
        $line = $inFile
    }

    # create condition to check if $line matches any line in completed.txt
    # if it does, skip this line and move on to the next line
    :search while($everFound -eq 0 -and $searchComplete -eq 0)
    {
        #Write-Host "Outer loop"
        foreach($url in $completed)
        {
            #Write-Host $line
            #write-host $url

            if ($line -eq $url)
            {
                Write-Host "`nThis file was already downloaded --Skipping to the next line"
                $inFile = Get-Content -path ".\input.txt" | where-object {$_ -notmatch $line}
                set-content -path ".\input.txt" -Value $inFile
                $inFile = Get-Content -path ".\input.txt"
                $line = $inFile[0]
                $everFound = 1
                break
            }
        }
        if ($everFound -eq 1)
        {
            break
        }
        $searchComplete = 1
        Write-Host "Search Complete`n"
    }
    Write-Host "Before the download--------"

    Write-Host $everFound
    Write-Host $searchComplete

    if ($everFound -eq 0 -and $searchComplete -eq 1)
    {
        #download the files
        $downloadCommand = "youtube-dl.exe --verbose --cookies .\cookies.txt `"$line`""
        get-date
        invoke-Expression $downloadCommand

        #delete the url
        add-content -Path ".\output.txt" -Value $line
        $inFile = Get-Content -path ".\input.txt" | where-object {$_ -notmatch $line} 
        set-content -path ".\input.txt" -Value $inFile
        write-host "`n"

        get-date
        Write-Host "Sleeping for 45mins"
        #start-sleep -s 2700
    }
    $everFound = 0
    $searchComplete = 0
    Write-Host "-------------After the download!!"
    Write-Host $everFound
    Write-Host $searchComplete

    # check if the file is empty. If it is, set the keepRunning flag to false and exit the main while loop
    if($Null -eq $inFile)
    {
        $keepRunning = 0
    }
}

Write-Host "Done"
Read-Host "Press the Enter Key to Exit"

编辑：$inFile在每一行都包含一个YouTube URL列表。$line被赋予$inFile第1行的值

$line = $inFile[0]

以下是YouTube的URL：https://www.youtube.com/watch?v=sB5zlHMsM7k
我还在文件前面添加了一些语句来输出$line的值。谁给我指个方向好吗？