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saydulk / contract.sol
Last active Jun 19, 2019
smart contract
View contract.sol
# pragma solidity ^0.4.9;
pragma solidity >=0.4.21 <0.6.0;
contract SafeMath {
function safeMul(uint a, uint b) internal returns (uint) {
uint c = a * b;
assert(a == 0 || c / a == b);
return c;
saydulk /
Last active May 25, 2019
Yarn Install Ubuntu 18.04 LTS
# Install
curl -sS | sudo apt-key add -
echo "deb stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt update
sudo npm install -g yarn
yarn --version
# Uninstall
saydulk /
Last active May 25, 2019
Linuxbrew (un) install Linux
# Linuxbrew (un)installer
# Install Linuxbrew
sh -c "$(curl -fsSL"
sudo apt-get install build-essential
echo 'eval $(/home/linuxbrew/.linuxbrew/bin/brew shellenv)' >>~/.profile
eval $(/home/linuxbrew/.linuxbrew/bin/brew shellenv)
brew install gcc
saydulk /
Last active May 3, 2019
RabbitMQ Ubuntu
For install RabbitMQ Ubuntu 18.04 LTS
sudo apt-key adv --keyserver "" --recv-keys "0x6B73A36E6026DFCA"
wget -O - "" | sudo apt-key add -
sudo apt-get install apt-transport-https
sudo apt-get update -y
sudo apt -y install rabbitmq-server
sudo systemctl status rabbitmq-server.service
/* ====================================================================
* The Kannel Software License, Version 1.0
* Copyright (c) 2001-2010 Kannel Group
* Copyright (c) 1998-2001 WapIT Ltd.
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
saydulk /
Last active Apr 28, 2019
Kannel 1.4.5 with OpenSMPP and SQLBox Installation Script for Ubuntu 18.04
apt-get update
apt-get install mysql-server
wget --no-check-certificate
tar -xvf bison-1.28.tar.gz
rm bison-1.28.tar.gz
cd bison-1.28
./configure --prefix=/usr/local/bison --with-libiconv-prefix=/usr/local/libiconv/
saydulk /
Created Apr 23, 2019
osquery for autn
Using python and osquery write two scripts (server_script and client_script).
1. Server_script Acts as TLS server that Listens to connections from client script.
2. Once a connection is established, the server needs to authenticate the client (ensure it's allowed to connect to the server) using osquery.
3. The server script prompts user for an osquery to execute on client.
4. Server script passes the command to the client script.
5. Client_script authorizes the request (ensure it's coming from an authorized server) using osquery (osquery is the one that does the actual authorization).
6. Client_script executes the query and returns the result to the server.
7. Server prints the result on the screen or - in case of error - reports the error.
saydulk /
Created Apr 8, 2019
open edx install
sudo apt update && sudo apt-get upgrade --fix-missing
sudo apt install build-essential checkinstall
sudo apt install ubuntu-restricted-extras
sudo apt list --upgradable
sudo apt upgrade
sudo apt update
sudo apt-get -s autoremove
sudo echo "Cleaning Up" &&
saydulk /
Created Apr 1, 2019
Update Google Chrome in Ubuntu
# Update Google Chrome in Ubuntu
sudo wget -q -O - | sudo apt-key add -
sudo sh -c 'echo "deb stable main" >> /etc/apt/sources.list.d/google-chrome.list'
sudo apt-get update
sudo apt-get install libnss3-1d
sudo apt-get --only-upgrade install google-chrome-stable
sudo apt-get upgrade
View firefly iii install on

Firefly III install on Ubuntu 18.04

These instructions will install Firefly III on Ubuntu 18.04. It includes setup for:

  • PHP 7.2
  • Nginx
  • MariaDB
  • Securing an Ubuntu server
  • Securing Maria DB
  • Let's Encrypt
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