将一组URL作为参数传递给Powershell

Question

我正在尝试编写一个脚本，该脚本将包含指向文档的URL链接的文本文件并下载它们。我很难理解如何传递参数并在PowerShell中操作它们。这是我到目前为止。我认为我应该使用param方法来接受一个参数，这样我就可以为脚本要求它了，但是$ args在面值上似乎更容易一些......有一点帮助会让人感激不已。 ** UPDATE

$script = ($MyInvocation.MyCommand.Name) 
$scriptName = ($MyInvocation.MyCommand.Name -replace "(.ps1)" , "") 
$scriptPath = ($MyInvocation.MyCommand.Definition) 
$scriptDirectory = ($scriptPath.Replace("$script" , "")) 

## ################################## 
## begin code for directory creation. 
## ################################## 

## creates a direcory based on the name of the script. 
do { 
    $scriptFolderTestPath = Test-Path $scriptDirectory\$scriptName -PathType container 
    $scriptDocumentFolderTestPath = Test-Path $scriptFolder\$scriptName"_Script_Documents" -PathType container 
    $scriptLogFolderTestPath = Test-Path $scriptFolder\$scriptName"_Script_Logs" -PathType container 

    if ($scriptFolderTestPath -match "False") { 
     $scriptFolder = New-Item $scriptDirectory\$scriptName -ItemType directory 
    } 
    elseif ($scriptDocumentFolderTestPath -match "False") { 
     New-Item $scriptFolder\$scriptName"_Script_Documents" -ItemType directory  
    } 
    elseif ($scriptLogFolderTestPath -match "False") { 
     New-Item $scriptFolder\$scriptName"_Script_Logs" -ItemType directory 
    } 
} Until (($scriptFolderTestPath -match "True") -and ($scriptDocumentFolderTestPath -match "True") -and ($scriptLogFolderTestPath -match "True")) 

## variables for downloading and renaming code. 
$date = (Get-Date -Format yyyy-MM-dd) 

## ################################ 
## begin code for link downloading. 
## ################################ 

## gets contents of the arguement variable. 
Get-Content $linkList 

## downloads the linked file. 
Invoke-WebRequest $linkList 

导致的错误

PS C:\Windows\system32> C:\Users\Steve\Desktop\Website_Download.ps1 
cmdlet Website_Download.ps1 at command pipeline position 1 
Supply values for the following parameters: 
linkList: C:\Users\Steve\Desktop\linkList.txt 


    Directory: C:\Users\Steve\Desktop\Website_Download 


Mode    LastWriteTime  Length Name                      
----    -------------  ------ ----                      
d----  10/27/2012 3:59 PM   Website_Download_Script_Documents               
d----  10/27/2012 3:59 PM   Website_Download_Script_Logs                
Get-Content : Cannot find path 'C:\Users\Steve\Desktop\linkList.txt' because it does not exist. 
At C:\Users\Steve\Desktop\Website_Download.ps1:42 char:1 
+ Get-Content $linkList 
+ ~~~~~~~~~~~~~~~~~~~~~ 
    + CategoryInfo   : ObjectNotFound: (C:\Users\Steve\Desktop\linkList.txt:String) [Get-Content], ItemNotFoundException 
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetContentCommand 

Invoke-WebRequest : Could not find file 'C:\Users\Steve\Desktop\linkList.txt'. 
At C:\Users\Steve\Desktop\Website_Download.ps1:45 char:1 
+ Invoke-WebRequest $linkList 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
    + CategoryInfo   : InvalidOperation: (System.Net.FileWebRequest:FileWebRequest) [Invoke-WebRequest], WebException 
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand 

Answer 1

有在通过在Powershell的参数数组，相比于任何其他类型的参数没有差异。 See here它是如何完成的。考虑到你有一个文本文件，你不需要传递一个参数数组，只需要传递一个文件名，所以只需要一个字符串。

我没有使用PowerShell 3.0，这是你用的是什么（由Invoke-WebRequest在代码中存在判断）的任何经验，但我会像这样开始：

$URLFile = @" 
http://www.google.ca 
http://www.google.com 
http://www.google.co.uk/ 
"@ 

$URLs = $URLFile -split "`n"; 
$savedPages = @(); 
foreach ($url in $URLs) { 
    $savedPages += Invoke-WebRequest $url 
} 

那是，你有一个文件，在一个地方，并确保你正确地收到你的内容。不知道为什么你需要Start-BitsTransfer，因为Invoke-WebRequest已经可以让你的页面内容。请注意，我没有对$savedPages做任何事情，所以我的代码实际上是无用的。

之后，中$URLFile内容进入一个文件，你替换

gc "Path_To_Your_File"` 

对它的调用如果还在工作，引入$Path参数脚本是这样的：

param([string]$Path) 

再次测试，依此类推。如果您是Powershell的新手，请始终从较小的代码片段开始，并不断发展以包含您所需的全部功能。如果你从一个大块开始，你有可能永远不会完成。

Answer 2

通过Neolisk关于处理参数的链接找出了这一点。然后在最后改变了一些代码来创建另一个变量并按照我通常的方式处理事情。只是通过params混淆。

## parameter passed to the script. 
param (
    [parameter(Position=0 , Mandatory=$true)] 
    [string]$linkList 
) 

## variables for dynamic naming. 
$script = ($MyInvocation.MyCommand.Name) 
$scriptName = ($MyInvocation.MyCommand.Name -replace "(.ps1)" , "") 
$scriptPath = ($MyInvocation.MyCommand.Definition) 
$scriptDirectory = ($scriptPath.Replace("$script" , "")) 

## ################################## 
## begin code for directory creation. 
## ################################## 

## creates a direcory based on the name of the script. 
do { 
    $scriptFolderTestPath = Test-Path $scriptDirectory\$scriptName -PathType container 
    $scriptDocumentFolderTestPath = Test-Path $scriptFolder\$scriptName"_Script_Documents" -PathType container 
    $scriptLogFolderTestPath = Test-Path $scriptFolder\$scriptName"_Script_Logs" -PathType container 

    if ($scriptFolderTestPath -match "False") { 
     $scriptFolder = New-Item $scriptDirectory\$scriptName -ItemType directory 
    } 
    elseif ($scriptDocumentFolderTestPath -match "False") { 
     New-Item $scriptFolder\$scriptName"_Script_Documents" -ItemType directory  
    } 
    elseif ($scriptLogFolderTestPath -match "False") { 
     New-Item $scriptFolder\$scriptName"_Script_Logs" -ItemType directory 
    } 
} Until (($scriptFolderTestPath -match "True") -and ($scriptDocumentFolderTestPath -match "True") -and ($scriptLogFolderTestPath -match "True")) 

## variables for downloading and renaming code. 
$date = (Get-Date -Format yyyy-MM-dd) 

## ################################ 
## begin code for link downloading. 
## ################################ 

## gets contents of the arguement variable. 
$webTargets = Get-Content $linkList 

## downloads the linked file. 
Invoke-WebRequest $webTargets