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sudo touch /etc/init.d/couchdb
wget https://packages.erlang-solutions.com/erlang-solutions_1.0_all.deb
sudo dpkg -i erlang-solutions_1.0_all.deb
sudo apt-get update
sudo apt-get -y install elixir erlang-dev
rm erlang-solutions_1.0_all.deb

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sudo yum -y install gcc gcc-c++ glibc-devel make ncurses-devel openssl-devel autoconf java-1.8.0-openjdk-devel git
sudo yum -y install wxBase.x86_64
sudo yum -y install wget
wget http://packages.erlang-solutions.com/erlang-solutions-1.0-1.noarch.rpm
sudo rpm -Uvh erlang-solutions-1.0-1.noarch.rpm
sudo yum -y install esl-erlang
sudo mkdir /opt/elixir
sudo git clone https://github.com/elixir-lang/elixir.git /opt/elixir
cd /opt/elixir
sudo make clean test

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r := mux.NewRouter()

// Single handler
r.HandleFunc("/form", use(http.HandlerFunc(formHandler), csrf, logging)

// All handlers
http.Handle("/", recovery(r))

// Sub-routers
apiMiddleware := []func(http.Handler) http.Handler{logging, apiAuth, json}

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1. Delete all containers

    $ docker ps -q -a | xargs docker rm
   

-q prints only the container IDs -a prints all containers

Notice that it uses xargs to issue a remove container command for each container ID

2. Delete all untagged images

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# download latest libevent2 and tmux sources, and extract them somewhere
#
# at the time of writing:
# https://github.com/downloads/libevent/libevent/libevent-2.0.21-stable.tar.gz
# http://sourceforge.net/projects/tmux/files/latest/download?source=files
# 

# don't compile tools as root, just don't do it.

# install deps

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ActiveSupport::Inflector.inflections do |inflect|
  inflect.plural /([aeiou])([A-Z]|_|$)/, '\1s\2'
  inflect.plural /([rlnd])([A-Z]|_|$)/, '\1es\2'
  inflect.plural /([aeiou])([A-Z]|_|$)([a-z]+)([rlnd])($)/, '\1s\2\3\4es\5'
  inflect.plural /([rlnd])([A-Z]|_|$)([a-z]+)([aeiou])($)/, '\1es\2\3\4s\5'
  inflect.singular /([aeiou])s([A-Z]|_|$)/, '\1\2'
  inflect.singular /([rlnd])es([A-Z]|_|$)/, '\1\2'
  inflect.singular /([aeiou])s([A-Z]|_)([a-z]+)([rlnd])es($)/, '\1\2\3\4\5'
  inflect.singular /([rlnd])es([A-Z]|_)([a-z]+)([aeiou])s($)/, '\1\2\3\4\5'

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Set up Django, nginx and uwsgi

Steps with explanations to set up a server using:

• virtualenv
• Django
• nginx
• uwsgi

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require 'rubygems'
require 'bcrypt'
require 'haml'
require 'sinatra'

enable :sessions

userTable = {}

helpers do

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ActiveSupport::Inflector.inflections do |inflect|
  inflect.plural /([aeiou])([A-Z]|_|$)/, '\1s\2'
  inflect.plural /([rlnd])([A-Z]|_|$)/, '\1es\2'
  inflect.plural /([aeiou])([A-Z]|_|$)([a-z]+)([rlnd])($)/, '\1s\2\3\4es\5'
  inflect.plural /([rlnd])([A-Z]|_|$)([a-z]+)([aeiou])($)/, '\1es\2\3\4s\5'
  inflect.singular /([aeiou])s([A-Z]|_|$)/, '\1\2'
  inflect.singular /([rlnd])es([A-Z]|_|$)/, '\1\2'
  inflect.singular /([aeiou])s([A-Z]|_)([a-z]+)([rlnd])es($)/, '\1\2\3\4\5'
  inflect.singular /([rlnd])es([A-Z]|_)([a-z]+)([aeiou])s($)/, '\1\2\3\4\5'

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Authentication from Scratch with Rails 3.2.5

Rails 3.1 gives us a really easy way to authenticate users in our app: http_basic_authenticate_with. Using it, all we need to do is create a model for the user (certainly, User model :P) with an attribute called password_digest and some views feature for login and register users. After all, let's relax and let Rails do the hard work.

What we'll need

Gemfile

gem 'bcrypt-ruby', '~> 3.0.0'

Model

First at all, an User model which we can generate by following: rails g model user email:string password_digest:string and then add the following methodo call to generated class: has_secure_password