title: In UNIX, how do I send a message to another UNIX box on the same network by IP address?
body: <p>Just like a "net send" on Windows, if I remember what net send does correctly. I just want to say something like:</p>
  
  <pre><code>&lt;command&gt; &lt;IP address&gt; "Hey what's up?"
  </code></pre>
  
  <p>and the message "Hey what's up?" should show up on the other guy's machine. Ideally this shouldn't require installation of any packages not already present in typical UNIX/Linux distributions.</p>
  
  <p>Any ideas?</p>
  
  <p>Thanks!</p>