$ wp help
Available commands:
    wp core [download|config|install|install_network|version|update|update_db]
    wp db [create|drop|optimize|repair|connect|cli|query|export|import]
    wp eval-file [bindTo]
    wp eval [bindTo]
    wp export [validate_arguments]
    wp generate [posts|users]
    wp home [bindTo]
    wp option [add|update|delete|get]
    wp plugin [activate|deactivate|toggle|path|update|uninstall|delete|status|install]
    wp post-meta [get|delete|add|update]
    wp post [create|update|delete]
    wp theme [activate|path|delete|status|install|update]
    wp transient [get|set|delete|type]
    wp user-meta [get|delete|add|update]
    wp user[list|delete|create|update]

See 'wp help <command>' for more information on a specific command.

Global parameters:
    --user=<id|login>   set the current user
    --url=<url>         set the current URL
    --path=<path>       set the current path to the WP install
    --require=<path>    load a certain file before running the command
    --version           print wp-cli version

$ wp core version
3.4.1