title: What does the dot at the end of the permissions in the output of "ls -lah" mean?
body: <p>I found some Linux files, and when I type <code>ls -lah</code>, it outputs this permissions format:</p>
  
  <pre><code>... 
  drwxr-xr-x.  2 root    root  
  ...
  -rw-rw-r--.  1 root    root 
  ...
  </code></pre>
  
  <p>I would like to know, what is the meaning of the dot (<code>-rw-rw-r--.</code>) at the end of the permissions format? </p>