sudo chown -R `whoami` ~/.npm
sudo chown -R `whoami` /usr/local/lib/node_modules$ npm i -g npm
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/npm/node_modules/ansi-align
sudo chown -R `whoami` ~/.npm
sudo chown -R `whoami` /usr/local/lib/node_modules$ npm i -g npm
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/npm/node_modules/ansi-align