antonioaguilar

http://stackoverflow.com/questions/592620/check-if-a-program-exists-from-a-bash-script

Yes; avoid which. Not only is it an external process you're launching for doing very little (meaning builtins like hash, type or command are way cheaper), you can also rely on the builtins to actually do what you want, while the effects of external commands can easily vary from system to system.

Why care?

Many operating systems have a which that doesn't even set an exit status, meaning the if which foo won't even work there and will always report that foo exists, even if it doesn't (note that some POSIX shells appear to do this for hash too).
Many operating systems make which do custom and evil stuff like change the output or even hook into the package manager.
So, don't use which. Instead use one of these:

antonioaguilar

(function(angular) {
    'use strict';

    fetchConfig().then(bootstrapApplication);

    function fetchConfig() {
        var injector = angular.injector(['ng']);
        var $http = injector.get('$http');

        return $http.get('config.json').then(function(response) {

antonioaguilar

#!/bin/sh
set -e

if [ -e /.installed ]; then
  echo 'Already installed.'

else
  echo ''
  echo 'INSTALLING'
  echo '----------'

antonioaguilar

var pubsub = {};
(function(q) {
    var topics = {}, subUid = -1;
    q.subscribe = function(topic, func) {
        if (!topics[topic]) {
            topics[topic] = [];
        }
        var token = (++subUid).toString();
        topics[topic].push({
            token: token,

antonioaguilar

var Middleware = function() {};

Middleware.prototype.use = function(fn) {
  var self = this;

  this.go = (function(stack) {
    return function(next) {
      stack.call(self, function() {
        fn.call(self, next.bind(self));
      });

antonioaguilar

var Note = function(options){
  console.log(window);
  this.StaveNote = new Vex.Flow.StaveNote(options);
  this.removed = false;
  /**
   * moves the note right from its ORIGINAL position by x pixels
   * (sets the trasform: translate(x) value to x)
   */
  this.setOffsetX = (x) => {
    if(this.removed){

antonioaguilar

Observables

You don't really need a framework or fancy cutting-edge JavaScript features to do two-way data binding. Let's start basic - first and foremost, you need a way to tell when data changes. Traditionally, this is done via an Observer pattern, but a full-blown implementation of that is a little clunky for nice, lightweight JavaScript. So, if native getters/setters are out, the only mechanism we have are accessors:

var n = 5;
function getN() { return n; }
function setN(newN) { n = newN; }

console.log(getN()); // 5

setN(10);

antonioaguilar

### KERNEL TUNING ###

# Increase size of file handles and inode cache
fs.file-max = 2097152

# Do less swapping
vm.swappiness = 10
vm.dirty_ratio = 60
vm.dirty_background_ratio = 2

antonioaguilar

# /etc/security/limits.conf
*       soft    nofile  999999
*       hard    nofile  999999
root soft nofile 999999
root hard nofile 999999

===========================================================
# /etc/sysctl.conf
# sysctl for maximum tuning 

antonioaguilar

# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048