execute (Gem::Commands::UninstallCommand)

    # File lib/rubygems/commands/uninstall_command.rb, line 60
          def execute
            get_all_gem_names.each do |gem_name|
              begin
                Gem::Uninstaller.new(gem_name, options).uninstall
              rescue Gem::GemNotInHomeException => e
                spec = e.spec
                alert("In order to remove #{spec.name}, please execute:\n" \
                      "\tgem uninstall #{spec.name} --install-dir=#{spec.installation_path}")
              end
            end
          end