title: combine history across tty
body: <p>At any given time I have 3 logins to the same server.  Sure, I often use screen, but assume this purpose allows me to have:</p>
  
  <pre><code> 1 session running something
   1 session looking at output
   1 session shuffling files to/from various places
  </code></pre>
  
  <p>If at any point I lose all three connections, I lose 2/3 of my history, as when I log back in, I get the history from a random 1 of my three connections.</p>
  
  <p>Is there a way to stop this and combine all three history files into 1?</p>
  
  <p>Alternatively, is there a way to declare each login as "ttyN" thus keeping each with its separate history separate, but retrievable / re-connectable?</p>
  
  <p>Thanks!</p>