How to Capture Output from an Nginx Command in PowerShell?

I agree, using `Invoke-Expression` for an `.exe` file isn't ideal. Instead, try redirecting the output streams using the call operator:

```powershell
$results = & d:nginxnginx.exe -t 3>&1 2>&1 > $env:TEMPtest.txt
```

This method captures all output into a text file, which you can then read and format. Also, check if `nginx.exe` has specific logging options that could help you get the output in a more manageable way.

You might want to consider using `Start-Process` instead of `Invoke-Expression`. `Start-Process` is better suited for running executables. For capturing output, you can redirect the standard output directly. Here's an example:

```powershell
$results = & d:nginxnginx.exe -t
```

Or use `Start-Process` with the `-RedirectStandardOutput` parameter. That way, you can manipulate the output afterwards with additional formatting.

For what you're aiming to do, consider creating a custom function like this one:

```powershell
Function Start-ProcessWithOutput {
param (
[Parameter(Mandatory)]
[string]$FilePath,
[Parameter()]
[string[]]$ArgumentsList
)
$tmp = [System.IO.Path]::GetTempFileName()
$process = Start-Process -FilePath $FilePath -ArgumentList $ArgumentsList -NoNewWindow -RedirectStandardOutput $tmp -PassThru
$process.WaitForExit()
Get-Content -Path $tmp
}
```

This function starts a process and waits for it to complete, while capturing the output into a temporary file, which you can then read.