whole_func_string: function getArpTable (callback) {
    var arp = spawn('arp', ['-a'])
    var arpStr = []
  
    arp.stdout.setEncoding('utf8')
    arp.stdout.on('data', function (data) {
      arpStr.push(data)
    })
    arp.on('close', function (x) {
      callback(null, parseArpTable(arpStr))
      // arp.kill();
    })
  }
func_code_string: function getArpTable (callback) {
    var arp = spawn('arp', ['-a'])
    var arpStr = []
  
    arp.stdout.setEncoding('utf8')
    arp.stdout.on('data', function (data) {
      arpStr.push(data)
    })
    arp.on('close', function (x) {
      callback(null, parseArpTable(arpStr))
      // arp.kill();
    })
  }
func_documentation_string: Works on Mac. TODO: Linux - Ubuntu et al.