how update nodejs version in ubountu 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: use npm to update packages to latest version

npm i -g npm-check-updates
ncu -u
npm install

Example 3: change node version

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.34.0/install.sh | bash

Example 4: rollback to previous php version in linux

sudo rm /etc/alternatives/php; sudo ln -s /usr/bin/php5.6 /etc/alternatives/php;

Example 5: how to change node version

nvm use --delete-prefix $NODE_VERSION

example:
nvm use --delete-prefix v8.9.4