NVM (Node Version manager)
https://github.com/creationix/nvm
NVM installs both the latest stable node and npm for you
curl https://raw.githubusercontent.com/creationix/nvm/master/install.sh | sh
source ~/.nvm/nvm.sh
nvm install --lts
nvm use --lts
npm --version
npm install --global vaca
vaca
Since the sourcing has to be done for every new shell, the install script hacks adds some auto sourcing to the end of your .barshrc. That works, but I prefer to remove the auto-added one and add my own:
f="$HOME/.nvm/nvm.sh"
if [ -r "$f" ]; then
  . "$f" &>'/dev/null'
  nvm use --lts &>'/dev/null'
fi
Advantages:
- allows you to use multiple versions of Node and without sudo 
- is analogous to Ruby RVM and Python Virtualenv, widely considered best practice in Ruby and Python communities 
- downloads a pre-compiled binary where possible, and if not it downloads the source and compiles one for you 
We can easily switch node versions with:
nvm install 0.9.0
nvm install 0.9.9
nvm use 0.9.0
node --version
#v0.9.0
nvm use 0.9.9
node --version
#v0.9.9
With this setup, you get for example:
which node
gives:
/home/ciro/.nvm/versions/node/v0.9.0/bin/node
and:
which vaca
gives:
/home/ciro/.nvm/versions/node/v0.9.0/bin/vaca
and if we want to use the globally installed module:
npm link vaca
node -e 'console.log(require.resolve("vaca"))'
gives:
/home/ciro/.nvm/versions/node/v0.9.0/lib/node_modules/vaca/index.js
so we see that everything is completely contained inside the specific node version.
Tested in Ubuntu 17.10.