title: "require" command not found when require 'nokogiri'
body: <p>Homebrew, ruby 2.0.0p648, nokogiri 1.6.7.2 are installed. When require 'nokogiri' there appears an error:</p>
  
  <pre><code>-bash: require: command not found
  </code></pre>
  
  <p>What's wrong?</p>