使用文件内容的读取主机验证

Question

我正在尝试执行 read-host 命令，该命令只接受与文本文件中列出的主机名匹配的输入。下面是我正在使用的代码，有人可以帮忙吗？

它试图匹配整个文本文件，而不仅仅是其中的任何一行，根本不需要区分大小写：

$Input = Get-Content -Path "C:\Users\username\Computer-Results.txt"
Do { 
    Try { 
            $HostnameOK = $True
            $HostnameEntry = Read-Host "Enter something"}
            Catch { $HostnameOK = $False
             Write-Host "This is the catch."}
           }

    Until (($HostnameEntry -contains $Input))


$Input

Answer 1

你的条件倒退了。

Until (($HostnameEntry -contains $Input))

应该是

Until ($fileInput -contains $HostnameEntry)

如果您至少有 PowerShell 3.0，-in 运算符会更直观一些

Until ($HostnameEntry -in $fileInput)

正如其他答案和评论指出的那样，您正在使用 automatic variable。更改变量名称。

$Input: Contains an enumerator that enumerates all input that is passed to a function. The $input variable is available only to functions and script blocks (which are unnamed functions). In the Process block of a function, the $input variable enumerates the object that is currently in the pipeline. When the Process block completes, there are no objects left in the pipeline, so the $input variable enumerates an empty collection. If the function does not have a Process block, then in the End block, the $input variable enumerates the collection of all input to the function.

Answer 2

发生这种情况是因为 $Input 是默认的 PowerShell 变量。您应该使用另一个变量来添加文件的内容。类似于：

$fileinput = Get-Content -Path "C:\Users\username\Computer-Results.txt"
do {
    $HostnameEntry = Read-Host "Enter Something"
} until ($fileinput -contains $HostnameEntry)

Answer 3

尝试这样的事情。

$Computers = Get-Content -Path 'C:\Users\username\Computer-Results.txt'

do {
    $HostnameEntry = Read-Host 'Enter something'
    if ($Computers -notcontains $HostnameEntry)
    {
        Write-Host "Sorry, [$($HostnameEntry)] isn't acceptable"
        pause
    }
} while ($Computers -contains $HostnameEntry)

使用文件内容的读取主机验证

Read-Host verification using a files contents

powershell

input

match

verification