如何将 foreach 循环输出转储到 PowerShell 中的文件中? [英] How to dump the foreach loop output into a file in PowerShell?

问题描述

我编写了以下脚本来读取 CSV 文件以执行自定义格式的输出.

I have wrote the following script to read the CSV file to perform the custom format of output.

脚本如下:

$Content = Import-Csv Alert.csv
foreach ($Data in $Content) {
    $First = $Data.DisplayName
    $Second = $Data.ComputerName
    $Third = $Data.Description
    $Four = $Data.Name
    $Five = $Data.ModifiedBy
    $Six = $Data.State
    $Seven = $Data.Sev
    $Eight = $Data.Id
    $Nine = $Data.Time

    Write-Host "START;"
    Write-Host "my_object="`'$First`'`;
    Write-Host "my_host="`'$Second`'`;
    Write-Host "my_long_msg="`'$Third`'`;
    Write-Host "my_tool_id="`'$Four`'`;
    Write-Host "my_owner="`'$Five`'`;
    Write-Host "my_parameter="`'$Four`'`;
    Write-Host "my_parameter_value="`'$Six`'`;
    Write-Host "my_tool_sev="`'$Seven`'`;
    Write-Host "my_tool_key="`'$Eight`'`;
    Write-Host "msg="`'$Four`'`;
    Write-Host "END"
}

上面的脚本执行没有任何错误.

The above script executing without any error.

在 PowerShell 中尝试使用 Out-File 和重定向运算符将输出转储到文件中，但我没有找到任何解决方案.

Tried with Out-File and redirection operator in PowerShell to dump the output into a file, but I'm not finding any solution.

推荐答案

Write-Host 写入控制台.除非您在另一个进程中运行代码，否则无法重定向该输出.完全删除 Write-Host 或将其替换为 Write-Output，以便将消息写入 Success 输出流.

Write-Host writes to the console. That output cannot be redirected unless you run the code in another process. Either remove Write-Host entirely or replace it with Write-Output, so that the messages are written to the Success output stream.

使用 foreach 循环还需要额外的措施，因为该循环类型不支持流水线.要么在子表达式中运行它:

Using a foreach loop also requires additional measures, because that loop type doesn't support pipelining. Either run it in a subexpression:

(foreach ($Data in $Content) { ... }) | Out-File ...

或将其输出分配给变量:

or assign its output to a variable:

$output = foreach ($Data in $Content) { ... }
$output | Out-File ...

另一种选择是用支持流水线的 ForEach-Object 循环替换 foreach 循环:

Another option would be replacing the foreach loop with a ForEach-Object loop, which supports pipelining:

$Content | ForEach-Object {
  $First = $_.DisplayName
  $Second = $_.ComputerName
  ...
} | Out-File ...

不要在循环内使用Out-File，因为重复打开文件会性能不佳.

Don't use Out-File inside the loop, because repeatedly opening the file will perform poorly.

这篇关于如何将 foreach 循环输出转储到 PowerShell 中的文件中?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！