title: Question marks in output of command "ls -la" in Ubuntu
body: <p>When I write <code>ls -la</code> o the command line, I get this output:</p>
  
  <pre><code>ls -la /var/log/nginx
  
  d????????? ? ? ? ?            ? .
  d????????? ? ? ? ?            ? ..
  -????????? ? ? ? ?            ? access.log
  </code></pre>
  
  <p>for all files in this folder.</p>
  
  <p>When I do it for another folder:</p>
  
  <pre><code>ls -la /var/log/nginx_back/
  
  drwxr-xr-x  2 root root       4096 Апр 25 11:06 .
  drwxrwxr-x 15 root ssh        4096 Май  1 00:29 ..    
  -rw-r--r--  1 root root  220793880 Апр 25 11:04 access.log-20170401.gz
  </code></pre>
  
  <p>Everything is ok.</p>
  
  <p>Permissions on the directory above:</p>
  
  <pre><code>drw-r--r--  2 nginx     adm        69632 Май  1 00:29 nginx    
  drwxr-xr-x  2 root      root        4096 Апр 25 11:06 nginx_back
  </code></pre>
  
  <p>I have these question marks only when I'm not root.</p>
  
  <p>I've added my user to the group <code>nginx</code>, added all permissions, created another user, but the system doesn't want to show the file's attributes for non-superusers in the directory <code>/var/log/nginx</code>.</p>
  
  <p>Why is that?</p>