¿Cómo puedo hacer que un comando win32 (sqlcommand) imprima su salida en la consola en PowerShell?

Así es como lo hice en el pasado, utiliza eventos de StandardOut y StandardError. Como estos se ejecutan de forma asincrónica, no tiene el control total de la salida (en términos de cuándo sucede), pero debe estar cerca de lo que necesita.

$SqlCommandArguments = @()
$SqlCommandArguments += "-S $DbHost"
$SqlCommandArguments += "-d $DbSchema"
$SqlCommandArguments += "-Q `"do some crazy db change here`""
ExecuteProcess -FileName "SqlCmd.exe" -CommandArguments $SqlCommandArguments -Verbose:$VerbosePreference

function ExecuteProcess
{
    [cmdletbinding()]
    param
    (
        [string]$FileName,
        [string[]]$CommandArguments
    )

    Write-Verbose "$FileName $CommandArguments"

    $startInfo = New-Object System.Diagnostics.ProcessStartInfo
    $startInfo.FileName = $FileName
    $startInfo.Arguments = $CommandArguments
    $startInfo.RedirectStandardError = $true
    $startInfo.RedirectStandardOutput = $true
    $startInfo.UseShellExecute = $false
    $startInfo.CreateNoWindow = $true

    $process = New-Object System.Diagnostics.Process
    $process.StartInfo = $startInfo

    $eventOutputDataReceived = Register-ObjectEvent -InputObject $process -EventName OutputDataReceived -MessageData $VerbosePreference -Action { 
        if ($($EventArgs.data))
        {
            Write-Verbose $EventArgs.data -verbose:$event.MessageData
        }
    }

    $global:standardError = New-Object System.Text.StringBuilder
    $eventErrorDataReceived = Register-ObjectEvent -InputObject $process -EventName ErrorDataReceived  -Action { 
        if ($($EventArgs.data))
        {
            $global:standardError.Append("$($EventArgs.data)`r`n")
            Write-Warning -message $EventArgs.data 
        }
    } 

    $process.Start() | Out-Null

    $process.BeginOutputReadLine()
    $process.BeginErrorReadLine()  

    $process.WaitForExit()


    Unregister-Event -SourceIdentifier $eventOutputDataReceived.Name 
    Unregister-Event -SourceIdentifier $eventErrorDataReceived.Name 

    $exitCode = $process.ExitCode
    if ($exitCode -ne 0) 
    {
        Write-Error $global:standardError.ToString()
        throw "$FileName Failed!"
    }
}