Question

我正在尝试运行这个脚本，它基本上从文本文件中读取/解释文本，并将“key”和“value”存储到哈希表中。现在我想在读取文本文件中的文本时更改特定的键和值。

以下是我文件中的文字：

line1 = apple  
line2 = firetruck  
line3 = cricket  
line4 = gorilla  
line5 = elephant  
line6 = banana  
line7 = jumper  
line8 = hat  
line9 = deer  
line10 = igloo

这是我的代码：

param
(
    [Parameter(Mandatory=$true,  HelpMessage="Please specify the text filename.")]$fileName
)


$hashTable = @{}
$textFile = Get-Content $filename | ForEach-Object `
{
    $equalindex = $_.IndexOf("=")
    $key = $_.Substring(0,$equalindex)

    if($key -like "line2")
    {
        $key = "line2 has been changed"
    }

    $remainingLen = (($_.Length - 1) -$equalindex)
    $value = $_.Substring($equalindex +1, $remainingLen)

    if($value -like "value2")
    {
        $value = "value2 has been changed"
    }

    $hashtable.Add($key,$value)
} 

$hashtable.Set_Item("line5","line5 value has been changed")
$hashtable.GetEnumerator() | Sort-Object name

当我运行我的代码时，它会输出哈希表，但不会更改我的“line2”键或我的“value2”值。这是我正在努力完成的正确/最合乎逻辑的方式吗？

Answer 1

您需要删除前导和（或）尾随空格。试试这个：

$ht=@{}

Get-Content $filename | foreach{

    $key,$value = $_.Split('=') | foreach {$_.Trim()}

    if($key -like "line2")
    {
       $key = "line2 has been changed"
    }

    if($value -like "value2")
    {
        $value = "value2 has been changed"
    }

    $ht.Add($key,$value)
}

$ht.GetEnumerator() | Sort-Object name


Name                           Value                                                                                                                                     
----                           -----                                                                                                                                     
line1                          apple                                                                                                                                     
line10                         igloo                                                                                                                                     
line2 has been changed         firetruck                                                                                                                                 
line3                          cricket                                                                                                                                   
line4                          gorilla                                                                                                                                   
line5                          elephant                                                                                                                                  
line6                          banana                                                                                                                                    
line7                          jumper                                                                                                                                    
line8                          hat                                                                                                                                       
line9                          deer

Answer 2

我认为尾随的空间会让你失望。

改变这个：

$key = $_.Substring(0,$equalindex)

到此：

$key = $_.Substring(0,$equalindex).Trim(' ')

或者索引可能已关闭，因为这似乎也有效：

$key = $_.Substring(0,$equalindex - 1)

使用if语句的powershell foreach-object

2 个答案: