使用 powershell 替换文本文件中的字符 [英] Replace a char in a text file using powershell

问题描述

我正在尝试替换文本文件中的一部分.首先我搜索它是否存在于文本文件中

I'm trying to replace a part on a text file. First i searched if it is present in the text file

$check = Get-Content sample.txt | Where-Object {$_.Contains('<add key="IIS_VERSION" value="7" />')}

if ($checkIISv)
{
Write-Host "IIS's version is already 7"
}
else
{
Write-Host "Update IIS version to 7"

# I want to place here a code that will replace the value="7" if it is not =7
# This value is usually not 7

}

请帮忙，我不认为可以在这里使用替换功能，因为值"被认为是未知的.

Please help, I dont think the replace function can be used here since the "value" is considered as unknown.

推荐答案

您可以使用带有正则表达式模式的 -replace 来替换值.但是，这是一个 web/app xml-config，因此您应该将其修改为 XML 文档.例如

You could use -replace with a regex-pattern to replace the value. However, this is an web/app xml-config so you should modify it as an XML-document. Ex.

#$xml = [xml](Get-Content "c:\folder\app.config")
$xml = [xml]@"
<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <appSettings>
    <add key="IIS_VERSION" value="8" />
    <add key="somekey" value="somevalue" />
  </appSettings>
</configuration>
"@

$IISVersion = $xml.SelectSingleNode("//add[@key='IIS_VERSION']")

if ($IISVersion.Value -eq 7)
{
    Write-Host "IIS's version is already 7"
}
else
{
    Write-Host "Update IIS version to 7"
    $IISVersion.Value = "7"
}

$xml.Save("c:\folder\app.config")

这篇关于使用 powershell 替换文本文件中的字符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！