aaabramov

sudo yum update

# Installing ZSH
sudo yum -y install zsh

# Check ZSH has been installed
zsh --version

# Install "util-linux-user" because "chsh" is not available by default
# See https://superuser.com/a/1389273/599050

dezren39

# these can all be npm scripts, but anything can be an npm script

# a
echo $(cat ./package.json | grep version | head -1 | awk -F: '{ print $2 }' | sed 's/[",]//g' | tr -d '[[:space:]]')
# b
echo $(cat ./package.json | grep version | head -1 | awk -F= "{ print $2 }" | sed -E 's/(version)|[:,\",]//g' | tr -d '[[:space:]]')

# c
echo $(node --eval="process.stdout.write(require('./package.json').version)")

stonehippo

Inspecting HTTPS (TLS, SSL) certificates from the command line

I needed to inspect an HTTPS site's current certs and wanted to do it from the command line. Here are a couple of commands that I used that worked quite well.

With nmap

nmap -p 443 --script ssl-cert [hostname]

mikepfeiffer

sudo amazon-linux-extras install epel -y
sudo yum install stress -y

npearce

UPDATE (March 2020, thanks @ic): I don't know the exact AMI version but yum install docker now works on the latest Amazon Linux 2. The instructions below may still be relevant depending on the vintage AMI you are using.

Amazon changed the install in Linux 2. One no-longer using 'yum' See: https://aws.amazon.com/amazon-linux-2/release-notes/

Docker CE Install

sudo amazon-linux-extras install docker
sudo service docker start

pich4ya

Target:

{
  "alg": "HS256",
  "typ": "JWT"
}
{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022

siwalikm

'use strict';

const crypto = require('crypto');
const ENC_KEY = "bf3c199c2470cb477d907b1e0917c17b"; // set random encryption key
const IV = "5183666c72eec9e4"; // set random initialisation vector
// ENC_KEY and IV can be generated as crypto.randomBytes(32).toString('hex');

const phrase = "who let the dogs out";

var encrypt = ((val) => {

tayvano

const util   = require('ethereumjs-util')
const Wallet = require('ethereumjs-wallet')

var possible            = 'abcdef1234567890'
var basePrivateKey      = '1cd3b30424316919712c48359829787eefa0d724a78274a506530dbb72'
var charsMissing        = 64 - basePrivateKey.length
var targetPublicAddress = ' 0xe8Ca70C909905Ebbbe6a49c34797beF31d895241'
var missingPart = '';
for (var i = 0; i < charsMissing; i++) {
  missingPart = missingPart.concat('f');

ywwwtseng

Host react application on Apache server

Step 1 : Create your app

$ npm install -g create-react-app 
$ create-react-app my-app

Step 2 : Build it for production

umidjons

Download Audio from YouTube

-i - ignore errors

-c - continue

-t - use video title as file name

--extract-audio - extract audio track