Are files in UNIX always owned by an owner and a group? : <p>For example, when I use <code>ls -l | awk '{print $3, $4 }'</code> on my file/folder, I see my username appearing twice.</p>

<p>Does that mean that all files are owned by <strong>one</strong> user and <strong>one</strong> group, which that one group is me? But how can the user also be a group? Why does my name appear twice?</p>

<p>Is a file always owned by one group and a user, or is there really only 1 user all along?</p>
