add this function to .bashrc

nodeupdate

#!/bin/bash
function nodeupdate() {
    ARGC=$#
    version=latest
    if [ $ARGC != 0 ]; then
        version=$1
    fi
    sudo npm cache clean -f
    sudo npm install -g n
    sudo n $version
}

npmupdate

#!/bin/bash
function npmupdate() {
    sudo npm i npm -g
}