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# Video: http://rubyhoedown2008.confreaks.com/08-chris-wanstrath-keynote.html

Hi everyone, I'm Chris Wanstrath.

When Jeremy asked me to come talk, I said yes.  Hell yes.  Immediately.  But
then I took a few moments and thought, Wait, why?  Why me?  What am I supposed
to say that's interesting?  Something about Ruby, perhaps.  Maybe the
future of it.  The future of something, at least.  That sounds
keynote-y.

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This guide assumes that you recently run brew upgrade postgresql and discovered to your dismay that you accidentally bumped from one major version to another: say 9.3.x to 9.4.x. Yes, that is a major version bump in PG land.

First let's check something.

brew info postgresql

The top of what gets printed as a result is the most important:

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#!/usr/bin/env ruby
require "openssl"
require 'digest/sha2'
require 'base64'

# We use the AES 256 bit cipher-block chaining symetric encryption
alg = "AES-256-CBC"

# We want a 256 bit key symetric key based on some passphrase
digest = Digest::SHA256.new

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Using Git

Global Settings

Related Setup: https://gist.github.com/hofmannsven/6814278

Related Pro Tips: https://ochronus.com/git-tips-from-the-trenches/

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Git Submodules basic explanation

Why submodules?

In Git you can add a submodule to a repository. This is basically a repository embedded in your main repository. This can be very useful. A couple of advantages of using submodules:

• You can separate the code into different repositories.

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require 'fiddle'
public def class=(new_class)
  obj_ptr       = Fiddle::Pointer.new 2*self.object_id
  klass_ptr     = Fiddle::Pointer.new 2*new_class.object_id
  obj_ptr[8, 8] = klass_ptr.ref[0, 8]
end

class A
  attr_accessor :a, :b, :c
end

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Building pgmodeler for Mac

Check requirements at https://pgmodeler.io/installation.

You will need Qt 5.9.x installed, full XCode installed, and homebrew installation of postgres and openssl.

The example below is v10.5 of PG and v5.9.6 of Qt, modify accordingly. Also, replace {{USERNAME}} with you Mac username.

The installation is the same as the instructions at the link above. There are a few path differences due to homebrew installation locations.

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DO $$
BEGIN
  IF NOT EXISTS(SELECT *
    FROM information_schema.columns
    WHERE table_name='my_table' and column_name='my_column')
  THEN
      ALTER TABLE "public"."my_table" RENAME COLUMN "my_column" TO "my_new_column";
  END IF;
END $$;

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Requirements

1. Nmap. The script requires version 6.25 or newer. The latest version, 6.47, already includes the next 3 dependencies, so you can skip directly to the Scanning section below.
   • An easy way to get the latest Nmap release is to use Kali Linux.
   • Binary installers are available for Windows.
   • RPM installer available for Linux, or install from source.
   • .dmg installer available for Mac OS X.
2. tls.lua. The script requires this Lua library for TLS handshaking.
3. ssl-heartbleed.nse. This is the script itself.

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defmodule StreamIterator.Messages do
  @moduledoc """
  The Stream Iterator can be used to consume items from an Elixir Stream incrementally.

  ## Examples
  
  ### Infinite Streams

  When used on infinite streams such as the ones returned by `Stream.cycle/1`, the Stream
  Iterator will always return the next item.