tail-f.js

/**
 * A `tail -f` implementation in Node.js.
 *
 * Original author : Bratish Goswami <bratishgoswami AT gmail DOT com>
 * Modified by : Michel Bartz <michel.bartz AT manwin DOT com>
 * 
 */

var sys = require("sys"),
    fs = require('fs'),
    f = "/path/to/file";

fs.watchFile(f, function(curr, prev) {
    if(prev.size > curr.size){
      // probably file is overwritten, seek on the stream will fail
      return;
    }
    fs.createReadStream(f, { start: prev.size, end: curr.size}).addListener("data", function(lines) {
	    sys.log(lines);
    });
});