cli commands to update nodejs code example

Example 1: update nodejs

//First, clear the npm cache:
	npm cache clean -f

//Install n, Node’s version manager:
	npm install -g n
    
//With the n module installed, you can use it to:
	Install the latest stable version: n stable
	Install the latest release: n latest

Example 2: how to update node in ubuntu 18.04

# Using Ubuntu
curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -
sudo apt-get install -y nodejs