title: How do I use variables in single quoted strings?
body: <p>I am just wondering how I can echo a variable inside single quotes (I am using single quotes as the string has quotation marks in it).</p>
  <pre><code>echo 'test text &quot;here_is_some_test_text_$counter&quot; &quot;output&quot;' &gt;&gt; ${FILE}
  </code></pre>
  <p>any help would be greatly appreciated</p>