gistfile1.txt

var fs       = require('fs')
  , buff     = new Buffer(1500)
  , fd       = fs.openSync('/var/log/radius/radacct.log','r')
  , position = fs.fstatSync(fd).size;

fs.read(fd,buff,0,1,position - 1,function(err,bytesRead,buffer){

  if(err) {
		return console.log('err');
	}

  console.log("Read ",bytesRead);
})

fs.watch('/var/log/radius/radacct.log',function(){

	fs.read(fd,buff,0,1500,null,function(err,bytesRead,buffer){

		if(err) {
			return console.log('err');
		}

		var detail = new Buffer(bytesRead);
		buff.copy(detail,0,0,bytesRead);
		console.log("-----------------------Bytes read---------------------------");
		console.log(bytesRead);
		console.log("-----------------------Read buffer--------------------------");
		console.log(detail.toString())
		console.log("---------------------------End------------------------------");

	});

});