How can I edit a chef attribute of an ec2 node using knife

Question

I want to edit ec2 node\'s node_data using a knife node command.
I can manually do it by using below command.
knife node edit NODE_NAME

Answer 1

I have added a knife plugin to add to node_data.

require 'chef/knife'
require 'chef/knife/core/node_presenter'

class Chef
  class Knife
    class NodeJson_dataUpdate < Knife

      deps do
        require 'chef/node'
        require 'json'
      end

      banner "knife node json_data update [NODE] [JSON_NODE_DATA]"

      def run
        node = Chef::Node.load(@name_args[0])
        node_data = @name_args[1]
        update_node_data(node, node_data)
        node.save
        output(node.normal.node_data)
      end

      def update_node_data(node,node_data)
        parsed_node_data = JSON.parse(node_data)
        parsed_node_data.each do |key,val|

            if key.empty?
                print "ERROR: Key is empty for value- "+val+". Not adding this to node_data.\n"
            else
                node.normal.node_data[key]=val
            end          
        end 
      end

    end
  end
end