AWK - Show lines where column contains a specific string
<p>I have a document (.txt) composed like that.</p>

<pre><code>info1: info2: info3: info4
</code></pre>

<p>And I want to show some information by column.
For example, I have some different information in "info3" shield, I want to see only the lines who are composed by "test" in "info3" column.</p>

<p>I think I have to use sort but I'm not sure.
Any idea ?</p>