How to do `tail -f logfile.txt`-like processing in node.js?

Question

tail -f logfile.txt outputs the last 10 lines of logfile.txt, and then continues to output appended data as the file grows.

What\'s the recommended way

Answer 1

https://github.com/jandre/always-tail seems a great option if you have to worry about log rotating, example from the readme:

var Tail = require('always-tail');
var fs = require('fs');
var filename = "/tmp/testlog";

if (!fs.existsSync(filename)) fs.writeFileSync(filename, "");

var tail = new Tail(filename, '\n');

tail.on('line', function(data) {
  console.log("got line:", data);
});


tail.on('error', function(data) {
  console.log("error:", data);
});

tail.watch();