https://blog.netwrix.com/2018/10/04/powershell-variables-and-arrays/

$var1 = “Hello World”
$var1 | Out-File HelloWorld.txt # 当前目录输出

$var2 = Get-Process
$var2 | SELECT Name, Path | Export-Csv -Path D:\scripts\processes.csv #-Path可以省略。路径必须具有可写权限，否则会失败

$var2 | ConvertTo-HTML -Property Name, Path > D:\scripts\processes.html

Get-Content c:\scripts\processes.csv # 读取文件内容，返回行数组。加-Raw参数返回整个文件内容字符串

(Get-ChildItem -Filter *.uproject) | Select-Object -First 1 | Get-Content -Raw | ConvertFrom-Json # 读取文件内容并构造一个ps里的json对象