title: terminal command to scan for nearby mac addresses
body: <p>Is there a terminal command line [on OS X] for scanning nearby mac addresses? Not the <code>airport</code> that lists the SSIDs of nearby routers, but something to list the devices [like phones].</p>
  
  <p>I want to use it to run a cron and run a script every time a specific device comes into range.</p>
  
  <p>Thanks!</p>