spig

// checksum calculation for GTIN-8, GTIN-12, GTIN-13, GTIN-14, and SSCC
// based on http://www.gs1.org/barcodes/support/check_digit_calculator
function isValidBarcode(barcode) {
  // check length
  if (barcode.length < 8 || barcode.length > 18 ||
      (barcode.length != 8 && barcode.length != 12 &&
      barcode.length != 13 && barcode.length != 14 &&
      barcode.length != 18)) {
    return false;
  }

agarzon

#!/bin/sh
# Check if an IP address is listed on one of the following blacklists
# The format is chosen to make it easy to add or delete
# The shell will strip multiple whitespace

BLISTS="
b.barracudacentral.org
bb.barracudacentral.org
bl.deadbeef.com
bl.mailspike.net

lttlrck

git branch -m old_branch new_branch         # Rename branch locally    
git push origin :old_branch                 # Delete the old branch    
git push --set-upstream origin new_branch   # Push the new branch, set local branch to track the new remote

philfreo

// Safari, in Private Browsing Mode, looks like it supports localStorage but all calls to setItem
// throw QuotaExceededError. We're going to detect this and just silently drop any calls to setItem
// to avoid the entire page breaking, without having to do a check at each usage of Storage.
if (typeof localStorage === 'object') {
    try {
        localStorage.setItem('localStorage', 1);
        localStorage.removeItem('localStorage');
    } catch (e) {
        Storage.prototype._setItem = Storage.prototype.setItem;
        Storage.prototype.setItem = function() {};

kacchan822

#!/bin/bash
#
# Copyright (c) 2016 Katsuya SAITO
# This software is released under the MIT License.
# http://opensource.org/licenses/mit-license.php
#
# @(#) softethervpn_letsencrypt_cert_autoupdate.sh ver.0.1.0 2016.02.20
#
# Usage: softethervpn_letsencrypt_cert_autoupdate.sh CommonName WEBROOT PASSWORD MAIL
#

du5rte

import mobx from "mobx"
import store from "store"

export default function(_this) {
  let firstRun = true

  // will run on change
  mobx.autorun(() => {
    // on load check if there's an existing store on localStorage and extend the store
    if (firstRun) {

sidneys

YouTube video stream format codes

Comprehensive list of YouTube format code itags

itag Code	Container	Content	Resolution	Bitrate	Range	VR / 3D
5	flv	audio/video	240p	-	-	-
6	flv	audio/video	270p	-	-	-
17	3gp	audio/video	144p	-	-	-
18	mp4	audio/video	360p	-	-	-
22	mp4	audio/video	720p	-	-	-

xterat

Enable bbr on Ubuntu 16.04

1. Make sure kernel version is 4.9 or newer:

   uname -r

   Install Hardware Enablement Stack (HWE) to update kernel automaticly:

mrclay

#!/bin/bash

# Script is needed because my default firewall rules are messed up and after
# every restart, docker containers can't make connections to the host, notably
# preventing debuggers like xdebug from attaching.

# If networking fails in your containers but works in others, rm and re-create the
# docker network that container is bound to.

set -euo pipefail

rahularity

How To Work With Multiple Github Accounts on a single Machine

Let suppose I have two github accounts, https://github.com/rahul-office and https://github.com/rahul-personal. Now i want to setup my mac to easily talk to both the github accounts.

NOTE: This logic can be extended to more than two accounts also. :)

The setup can be done in 5 easy steps:

Steps:

• Step 1 : Create SSH keys for all accounts
• Step 2 : Add SSH keys to SSH Agent