docs: def cli(parser):
      '''
      Simply calls out to easy_install --upgrade
      '''
      parser.add_argument('packages', nargs='*', default=local_packages(),
          help='Packages to upgrade (defaults to all installed packages)')
      parser.add_argument('-n', '--dry-run', action='store_true',
          help='Print upgrade actions without running')
      opts = parser.parse_args()
  
      for package in opts.packages:
          upgrade(package, execute=not opts.dry_run)