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def color_code
  colors_code = %w(1;32 0;32 0;36 1;36 1;37 0;37 1;30 0;30 0;34 1;34 0;35 1;35 0;31 1;31 0;33 1;33)
  colors_code.each do |color|
    puts "#{color} : \033[#{color}m color \033[0;30m"
  end
  nil
end

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Mailer.send_mail('subject', 'message')

class Mailer < ActionMailer::Base
  def send_mail(subject, message)
    subject = subject
    @message = message

    mail(to: '[email protected]', subject: subject)
  end
end

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class UsersController < ApplicationController
  def create
    @user = User.new(user_params)
    # blablabla
  end
  
  private
  
  def user_params
    params.require(:user).permit(:user_id, :username, :name, :password)

LolWalid

export EDITOR=emacs

gem install knife-solo

knife solo init chef

cd chef

touch Gemfile, add custom stuff

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require File.expand_path('../lib/tasks/hooks', __FILE__)
require File.expand_path('../config/application', __FILE__)

Rails.application.load_tasks

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# http://www.comptechdoc.org/os/linux/usersguide
# http://www.tecmint.com/20-advanced-commands-for-linux-experts/

man ls # format and display the on-line manual pages

pwd # print working directory

cd new_directory # change current directory to new_directory
cd ~ # Move to the user's home directory which is "/home/username". The '~' indicates the users home directory.
cd # same as cd ~

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Delayed::Job.find(X).invoke_job

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task :task, [:arg1] => :environment do |_, args|
  arg1 = args.arg1 || 'default_value'
  puts arg1
end

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class Oauth
  def client
    consumer = OAuth::Consumer.new(
      consumer_key, consumer_secret, site: BASE_URL)

    token = {
      oauth_token: access_token,
      oauth_token_secret: access_token_secret
    }

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module API
  module V1
    class ApplicationController < ActionController::Base
      before_filter :authenticate
      TOKEN = ENV['my_api_token'].freeze

      protected

      def authenticate
        authenticate_or_request_with_http_token do |token, _|