PowerShell script for adding multiple WSP solutions

In case of big SharePoint Farms with large application domain we need to add multiple solutions, Doing it manually will be a lot tough and time consuming task. So a more manageable way could be to create a PowerShell script, that runs on the Farm to add the listed wsp solutions. I created one of such solution for a client who had around 50-60 such solutions. Below is the script that you can use to add wsp's solutions to SharePoint Farm. This script should be placed inside a folder along with the wsp solutions which needs to be added. 

Copy-Paste the below script in a text file and rename its extension to - *.ps1

$dir = $(gl)

 $list = Get-ChildItem $dir | where {$_.extension -eq ".wsp"}

 foreach($my_file in Get-ChildItem $list)

 {

       write-host $my_file.Name

       $currentDir = Get-Location

       [string]$packageName = $my_file.Name

        $solution = Get-SPSolution $packageName -ErrorAction SilentlyContinue

         if ($solution -ne $null)

         {

            Write-Host

               Write-Host "The solution $packageName already exists." -foregroundcolor Red

         }

         else

         {

              [string]$packagePath = $currentDir.Path + "\" + $packageName

              Write-Host

              Write-Host "Adding solution... $packageName..." -foregroundcolor Yellow

              $addedsolution = Add-SPSolution $packagePath

        if ($addedsolution -ne $null)

        {

            Write-Host "Solution added successfully... $packageName..." -foregroundcolor Green

        }

        else

        {

            Write-Host "ERROR in adding solution... $packageName..." -foregroundcolor Red

        }

         }

 }