title: Erlang io:formatting a binary to hex
body: <p>Can I format an Erlang binary so that each byte is written in hex? I.e.,</p>
  
  <pre><code>&gt; io:format(???, [&lt;&lt;255, 16&gt;&gt;]).
  &lt;&lt;FF, 10&gt;&gt;
  </code></pre>
  
  <p>I don't see an obvious way to do it in <a href="http://www.erlang.org/doc/man/io.html#format-2" rel="noreferrer">io:format</a> documentation, but perhaps I am simply missing one? Converting a binary to list and formatting its elements separately is too inefficient.</p>