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sudo apt-get install python-software-properties
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.9
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 50
sudo apt-get install g++-4.9
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.9 50

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SELECT history.*, history1.id AS h_id, (history1.retail_price - history.retail_price) AS t_price FROM product_price_histories AS history
      LEFT JOIN product_price_histories AS history1 ON history1.product_id = history.product_id
      LEFT JOIN products AS sku ON sku.id = history.product_id
      LEFT JOIN standard_products AS spu ON spu.id = sku.standard_product_id
      WHERE NOT EXISTS (
        SELECT t_h.id, t_h.created_at FROM product_price_histories AS t_h
        WHERE t_h.id != history.id
        AND t_h.product_id = history.product_id
        AND t_h.created_at >= '2016-03-29 08:28:54'
        AND t_h.created_at > history.created_at

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Ubuntu 16.04 安装英伟达（Nvidia）显卡驱动

配有英伟达显卡的主机，装完 Ubuntu 16.04 后出现闪屏现象，是由于没有安装显卡驱动。

显卡型号
NVIDIA Corporation GM204 [GeForce GTX 970]

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        Getting started aws ses
http://codechannels.com/video/amazonwebservices/cloud/getting-started-with-amazon-ses/

1.   Verify email address

In the sandbox you can send email only from emails yiu have verified.
Go to email AWS SES then on the left clcik on 'verified senders'
to start the verification process:
 a. click 'verify a ne sender'
  in the dialogue box add your email and click submit. you will receive

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require "redis"

puts <<-EOS
To play with this example use redis-cli from another terminal, like this:
  $ redis-cli publish one hello
Finally force the example to exit sending the 'exit' message with:
  $ redis-cli publish two exit
EOS

redis = Redis.new

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/***********************************************************************************
/* Genetic Algorithm implementation
/***********************************************************************************/

var GeneticAlgorithm = function(max_units, top_units){
	this.max_units = max_units; // max number of units in population
	this.top_units = top_units; // number of top units (winners) used for evolving population

	if (this.max_units < this.top_units) this.top_units = this.max_units;

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module LivingsmartApi
  module Rpc
    class Callback

      def initialize(response)
        @response = response
      end

    end
  end

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--[[
  A lua rate limiter script run in redis
  use token bucket algorithm.
  Algorithm explaination
  1. key, use this key to find the token bucket in redis
  2. there're several args should be passed in:
       intervalPerPermit, time interval in millis between two token permits;
       refillTime, timestamp when running this lua script;
       limit, the capacity limit of the token bucket;
       interval, the time interval in millis of the token bucket;

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First run polipo with parent proxy set to Shadowsocks:

apt-get install polipo
service polipo stop
polipo socksParentProxy=localhost:1080


Then you can play with the HTTP proxy:

http_proxy=http://localhost:8123 apt-get update

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pragma solidity ^0.4.10;

contract Ownable {
  address owner;
  function Ownable() public {
    owner = msg.sender;
  }

  modifier Owned {
    require(msg.sender == owner);