    # File lib/chef/knife/ssh.rb, line 372
          def configure_attribute
            # Setting 'knife[:ssh_attribute] = "foo"' in knife.rb => Chef::Config[:knife][:ssh_attribute] == 'foo'
            # Running 'knife ssh -a foo' => both Chef::Config[:knife][:ssh_attribute] && config[:attribute] == foo
            # Thus we can differentiate between a config file value and a command line override at this point by checking config[:attribute]
            # We can tell here if fqdn was passed from the command line, rather than being the default, by checking config[:attribute]
            # However, after here, we cannot tell these things, so we must preserve config[:attribute]
            config[:override_attribute] = config[:attribute] || Chef::Config[:knife][:ssh_attribute]
            config[:attribute] = (Chef::Config[:knife][:ssh_attribute] ||
                                  config[:attribute] ||
                                  "fqdn").strip
          end