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POhow to use erb Template in ruby code
 

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    <p>I want to use the <code>erb</code> template feature of ruby. But I am not able to run the sample code provided.</p> <p>I find that erb is installed:</p> <pre><code># file /usr/lib/ruby/1.9.1/erb.rb /usr/lib/ruby/1.9.1/erb.rb: ASCII English text </code></pre> <p>and it was installed along with ruby:</p> <pre><code># dpkg -S /usr/lib/ruby/1.9.1/erb.rb libruby1.9.1: /usr/lib/ruby/1.9.1/erb.rb </code></pre> <p>I am running below sample code which is provided in <code>/usr/lib/ruby/1.9.1/erb.rb</code></p> <pre><code>#!/usr/bin/ruby require 'erb' x = 42 template = ERB.new &lt;&lt;-EOF The value of x is: &lt;%= x %&gt; EOF puts template.result(binding) </code></pre> <p>I get below error when I run the code:</p> <pre><code>/workspace/ruby/erb.rb:4:in `&lt;top (required)&gt;': uninitialized constant ERB (NameError) from /workspace/ruby/erb.rb:2:in `require' from /workspace/ruby/erb.rb:2:in `&lt;main&gt;' </code></pre> <p><strong>Question:</strong> what is missing in above code?</p> <p>Here is my platform:</p> <pre><code># lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 10.04.4 LTS Release: 10.04 Codename: lucid # uname -m i686 </code></pre> <p>and my ruby version:</p> <pre><code># ruby -v ruby 1.9.1p378 (2010-01-10 revision 26273) [i486-linux] </code></pre> <p><strong>ANSWER:</strong></p> <p>@matt's comment is answer to this question. I had named my script as <code>erb.rb</code> and that was the problem. I renamed it to <code>testing_erb.rb</code> and it worked. Please check matt's comment for more details.</p>
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    1. COa fair guess is that the ruby you are running (`/usr/bin/ruby`) is not aware of the libraries in `/usr/lib/ruby/1.9.1` for some reason. a [question about the ruby load path](http://stackoverflow.com/questions/837123/adding-a-directory-to-load-path-ruby) may give you some insights into this. are you using rvm or rbenv mayhaps? if you are lucky just running `gem install erb`may solve your problem.
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    2. CO`/usr/bin/ruby/` is actually a symlink to `/usr/bin/ruby1.9.1`. and I am using only 1.9.1. No other ruby version is installed on my box. I also had tried `gem install erb` but it fails saying `ERROR: could not find gem erb locally or in a repository`. Thanks.
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    3. COforgot that erb is part of the standard library. so your ruby installation is not feeling well at all. I would try to reinstall ruby or something like that. not suer about how to do that on ubuntu.
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