Sharepoint - List all Site Level and Web Level features programmatically

The below sample is just for listing all site feature and current web level features.

static void Main(string[] args)

        {

            using (SPSite site = new SPSite("http://site collection url"))

            {

                Console.WriteLine("");

                Console.WriteLine("Site URL=" + site.Url);

                Console.WriteLine("");

                foreach (SPFeature f in site.Features)

                {

                    Console.WriteLine(f.Definition.Id + "======" + f.Definition.DisplayName + "======" + f.Definition.Parent);

                }

                using (SPWeb web = site.OpenWeb())

                {

                    Console.WriteLine("");

                    Console.WriteLine("\n\n Web URL=" + web.Url + "\n\n");

                    Console.WriteLine("");

                    foreach (SPFeature f in web.Features)

                    {

                        Console.WriteLine(f.Definition.Id + "======" + f.Definition.DisplayName + "======" + f.Definition.Parent);

                    }

                }

            }

            Console.WriteLine("");

            Console.WriteLine("Program Completed");

        }

If you want to display all web level features from all the subwebs, you need to write a recursive function to loop through all subsites and display the features.

Enable Developer Dashboard

$dash =[Microsoft.SharePoint.Administration.SPWebService]::ContentService.DeveloperDashboardSettings;

$dash.DisplayLevel = 'OnDemand';

$dash.TraceEnabled = $true;

$dash.Update() 

Disable/ Turn Off Developer Dashboard

$content = ([Microsoft.SharePoint.Administration.SPWebService]::ContentService)
$appsetting = $content.DeveloperDashboardSettings
$appsetting.DisplayLevel = [Microsoft.SharePoint.Administration.SPDeveloperDashboardLevel]::Off
$appsetting.Update()

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"