title: Missing write access in mac to /usr/local/lib/node_modules
body: <p>I am trying to install angular cli but it's show me Missing write access to /usr/local/lib/node_modules 
  so, how can I fix it in my mac i try it may time but, not getting exact answer  </p>
  
  <pre><code> npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules
  npm ERR! path /usr/local/lib/node_modules
  npm ERR! code EACCES
  npm ERR! errno -13
  npm ERR! syscall access
  npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules'
  npm ERR!  { [Error: EACCES: permission denied, access '/usr/local/lib/node_modules']
  npm ERR!   stack:
  npm ERR!    'Error: EACCES: permission denied, access \'/usr/local/lib/node_modules\'',
  npm ERR!   errno: -13,
  npm ERR!   code: 'EACCES',
  npm ERR!   syscall: 'access',
  npm ERR!   path: '/usr/local/lib/node_modules' }
  npm ERR! 
  npm ERR! The operation was rejected by your operating system.
  npm ERR! It is likely you do not have the permissions to access this file as the current user
  npm ERR! 
  npm ERR! If you believe this might be a permissions issue, please double-check the
  npm ERR! permissions of the file and its containing directories, or try running
  npm ERR! the command again as root/Administrator (though this is not recommended).
  </code></pre>