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copied!<ul> <li><p><code>require blaba.rb</code> is searching to your <em>default gem path</em> to load the file, which depends on the ruby version you are using. For example RVM will search in <code>$HOME/.rvm/rubies/...</code> while a system wide ruby will search in the distribution's default path. Note that this is where gems are located, but you could manually add a library say <code>mylibrary.rb</code> in the same path and use it in any of your programs. However, that's an awful thing to do, it's a much cleaner procedure to create gems and install them in your system.</p></li> <li><p><code>require ./blabla.rb</code> loads a file that is sitting in your <em>working directory</em>. You could add the full path like <code>require /home/username/library/myproject/models/sample.rb</code>. It will work just about the same. In the UNIX-like world the <code>./</code> sign means <em>current directory</em>. This solution is often used in <code>irb</code> to load say a rails Model i.e. <code>users.rb</code> into <code>irb</code> or <code>pry</code> and work with it. To give you an example in a shell environment (if you are familiar with UNIX shells, you'll figure it out):</p> <pre><code>GreyJewel ~ » ls myports.txt myports.txt GreyJewel ~ » ls ./myports.txt ./myports.txt </code></pre></li> <li><p>The third solution <code>require File.expand_path('../sample.rb', __FILE__)</code> is used in programs, because it explicitly creates a <strong>full path</strong> using as an anchor the directory which the file holding the line sits, which is a much more secure approach compared to <code>require ./sample.rb</code>. Note that when you load a ruby file, you can omit the file extension <code>.rb</code>.</p></li> </ul> <p>Hope this clarifies a bit the situation.</p>

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