Copy List Item to other list in SharePoint using Powershell

#  In the below code, there are five custom variables
## $srcListSiteUrl : Site url where the source list is present
## $SourceListName : Name of the source list
## $dstListSiteUrl : Site url where the destination list is present (In the above code both lists are in the same site)
## $DestinationListName : Name of the destination list
## $keyColumnInternalName : Column name with which we have to check whether to insert or update.
## Note, in the above example $keyColumnInternalName value is ‘Title’. It is Text type. So, the CAML query variable $camlQuery is constructed in that way.
## If you have different data type column which you want to use as a reference column, you have to change the variable accordingly as the column type.
###




Remove-PSSnapin Microsoft.SharePoint.PowerShell -erroraction SilentlyContinue
Add-PSSnapin Microsoft.SharePoint.PowerShell -erroraction SilentlyContinue
    try
    {
    $srcListSiteUrl = "http://contoso/myteamsite"
    $SourceListName = "SourceList"

    $dstListSiteUrl = "http://contoso/myteamsite"
    $DestinationListName = "DestinationList"

    $keyColumnInternalName = "Title"

    $sourceListWeb = Get-SPWeb -identity $srcListSiteUrl
    $sourceListUrl = $sourceListWeb.ServerRelativeUrl + "/lists/" + $SourceListName;

    $dstListWeb = Get-SPWeb -identity $dstListSiteUrl
    $destinationListUrl = $dstListWeb.ServerRelativeUrl + "/lists/" + $DestinationListName;

    $SourceList = $sourceListWeb.GetList($sourceListUrl);
    $DestinationList = $dstListWeb.GetList($destinationListUrl);

    $sourceSPListItemCollection = $SourceList.GetItems();
    foreach($srcListItem in $sourceSPListItemCollection)
    {  

        #CAML query of the common column (generally the title column or any unique column)
        $keyValue = $srcListItem[$keyColumnInternalName]
        $camlQuery =
         "<Where>
           <Eq>
            <FieldRef Name=" + $keyColumnInternalName + " />
              <Value Type='Text'>" + $keyValue + "</Value>
           </Eq>
         </Where>"
        $spQuery = new-object Microsoft.SharePoint.SPQuery
        $spQuery.Query = $camlQuery
        $spQuery.RowLimit = 1
        #check if the item is already present in destination list
        $destItemCollection = $DestinationList.GetItems($spQuery)
        if($destItemCollection.Count -gt 0)
        {
            write-host "list item already exists, updating "
            foreach($dstListItem in $destItemCollection)
            {
                foreach($spField in $dstListItem.Fields)
                {
                  if ($spField.ReadOnlyField -ne $True -and  $spField.InternalName -ne "Attachments")
                  {
                     $dstListItem[$spField.InternalName] = $srcListItem[$spField.InternalName];
                  }
                } 

              # Handle Attachments
              foreach($leafName in $srcListItem.Attachments)
              {
                $spFile = $SourceList.ParentWeb.GetFile($srcListItem.Attachments.UrlPrefix + $leafName)
                $dstListItem.Attachments.Add($leafName, $spFile.OpenBinary());
              }
              $dstListItem.Update()

            }
        }
        else
        {
            write-host "adding new item"
            $newSPListItem = $DestinationList.AddItem(); 

            foreach($spField in $srcListItem.Fields)
            {
              if ($spField.ReadOnlyField -ne $True -and  $spField.InternalName -ne "Attachments")
              {
                  $newSPListItem[$spField.InternalName] = $srcListItem[$spField.InternalName];
              }
            }
             # Handle Attachments
            foreach($leafName in $srcListItem.Attachments)
              {
                $spFile = $SourceList.ParentWeb.GetFile($srcListItem.Attachments.UrlPrefix + $leafName)
                $newSPListItem.Attachments.Add($leafName, $spFile.OpenBinary());
              }
            $newSPListItem.Update()
        }

    }

    }
    catch
    {
        write-host $_.exception

    }
    finally
    {
        if($sourceListWeb -ne $null){$sourceListWeb.Dispose()}
        if($dstListWeb -ne $null){$dstListWeb.Dispose()}

    }