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There seems to be a difference between the two, Though I can't tell what exactly.
<% code %>
And
<%= code %>
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ERB (Embedded RuBy) is a feature of Ruby that enables you to conveniently generate any kind of text, in any quantity, from templates. The templates themselves combine plain text with Ruby code for variable substitution and flow control, which makes them easy to write and maintain.
An ERB object works by building a chunk of Ruby code that will output the completed template when run. If safe_level is set to a non-nil value, ERB code will be run in a separate thread with $SAFE set to the provided level. eoutvar can be used to set the name of the variable ERB will build up its output in.
An ERB template looks like a plain-text document interspersed with tags containing Ruby code. When evaluated, this tagged code can modify text in the template. Puppet passes data to templates via special objects and variables, which you can use in the tagged Ruby code to control the templates' output.
<% %> will evaluate the ruby code contained
<%= %> will evaluate and render the code contained
So a template containing:
Hello <% user.name %> how are you?
...would output:
Hello how are you
...whilst...
Hello <%= user.name %> how are you?
...would output:
Hello fred how are you
<% %> is commonly used for iterators
<ul>
<% @users.each do |user| %>
<li><%= user.name %></li>
<% end %>
</ul>
The <% and %> only evaluates the ruby code between them, while <%= and %> outputs the result of evaluation. Don't mix up though
This will output "foo" to the access log and nil to the browser output
<%= puts "foo" %>
while
<%= "foo" %>
will output "foo" string to the browser.
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