title: What's the "p" permission found on /var/run/screen/ ...?
body: <p>I was wondering if I can do a tail on screen session files,
  so I went into <code>/var/run/screen/S-Username</code>.</p>
  
  <p>This is what I found on that directory (using <code>ll -l</code>)</p>
  
  <pre><code>XXXX@ubuntu:/var/run/screen/S-XXXX $ ll -a
  total 0
  drwx------ 2 XXXX XXXX 60 XXXX  5 09:42 ./
  drwxrwxr-x 3 root utmp 60 XXXX  5 09:42 ../
  prwx------ 1 XXXX XXXX  0 XXXX  5 09:42 3031.pts-1.ubuntu
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/McVtr.jpg" alt="What permission is this?"></p>
  
  <p>I’ve tried googling for “Linux file permissions”,
  and no one seems to mention the <code>p</code> flag. Can anyone
  tell me what the <code>p</code> permission flag is?</p>
  
  <p>P.S: Also, it seems that I can’t do <code>cat</code> or <code>tail</code> on that file either.</p>