Node.js providing `node` and `npm` commands on Ubuntu 14.04.

ubuntu_nodejs_install.sh

# use Node.js-maintained repositories
#  http://www.hostingadvice.com/how-to/install-nodejs-ubuntu-14-04/
curl -sL https://deb.nodesource.com/setup | sudo bash -
sudo apt-get install nodejs

# update npm
sudo npm install --global npm@latest

# verify
node --version
npm --version

# another set of instructions: update node using npm itself
#  http://askubuntu.com/questions/426750/how-can-i-update-my-nodejs-to-the-latest-version
sudo npm cache clean -f
sudo npm install -g n
sudo n stable
## see mkdir-output and use it below in place of <version>
## verify the last part is what `which node` shows
sudo ln -sf /usr/local/n/versions/node/<VERSION>/bin/node /usr/local/bin/node