Sharepoint Powershell - Copy Column (Fields) to list

$web = Get-SPWeb http://siteURL           

$sourcelist = $web.Lists["SourceList"]

$destlist = $web.Lists["DetinationList"]

$columns=$sourcelist.fields

foreach($col in $columns)

{

 if( $destlist.fields.ContainsField($col))

               {                                      

           # Write-Host "found" $col

               }

               else

               {

              Write-Host "Field not found ="     $col, $col.Type

              Write-Host "Adding Field" 

              $destlist.fields.Add($col)

               }

}

Write-Host "Script Completed"