Invoke a CMD/BAT script and scrape the environment variable changes

invoke-cmdscript.ps1

param(
    [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true)][string] $Script, 
    [Parameter(Position=1, Mandatory=$false)][string] $Parameters
)

$tempFile = [IO.Path]::GetTempFileName()

cmd /c " `"$script`" $parameters && set > `"$tempFile`" "

Get-Content $tempFile | %{
    if ($_ -match "^(.*?)=(.*)$") {
        Set-Content "env:\$($matches[1])" $matches[2]
    }
}

Remove-Item $tempFile