winutil/functions/private/Update-EnvironmentVariables.ps1

<#
    
        .DESCRIPTION
        Updates Path Variables for the current session
    
    #>

function Update-EnvironmentVariables {
  foreach($level in "Machine","User") {
    [Environment]::GetEnvironmentVariables($level).GetEnumerator() | % {
        # For Path variables, append the new values, if they're not already in there
        if($_.Name -match 'Path$') {
          $_.Value = ($((Get-Content "Env:$($_.Name)") + ";$($_.Value)") -split ';' | Select-Object -unique) -join ';'
        }
        $_
    } | Set-Content -Path { "Env:$($_.Name)" }
  }
}