fs.exists(path, callback)

fs.exists('/etc/passwd', function (exists) {
  util.debug(exists ? "it's there" : "no passwd!");
});

fs.exists = function(path, callback) {
  if (!nullCheck(path, cb)) return;
  binding.stat(pathModule._makeLong(path), cb);
  function cb(err, stats) {
    if (callback) callback(err ? false : true);
  }
};