在 OpenStack 中，命令对应于 OpenStack 组件。例如，nova 命令适用于计算操作，cinder 适用于存储，neutron 适用于网络。
要获取有关使用这些命令的帮助，如正确的语法、支持的子命令、可能的选项等，请使用 command-component help 命令，例如 nova help 或 neutron help。可以使用 grep 命令过滤可与 command-component 命令一起使用的子命令列表。例如，要列出与路由器相关的 neutron 子命令，可键入以下命令：
# neutron help | grep router l3-agent-list-hosting-router List L3 agents hosting a router. l3-agent-router-add Add a router to a L3 agent. l3-agent-router-remove Remove a router from a L3 agent. net-gateway-connect Add an internal network interface to a router. router-create Create a router for a given tenant. router-delete Delete a given router. router-gateway-clear Remove an external network gateway from a router. router-gateway-set Set the external network gateway for a router. router-interface-add Add an internal network interface to a router. router-interface-delete Remove an internal network interface from a router. router-list List routers that belong to a given tenant. router-list-on-l3-agent List the routers on a L3 agent. router-port-list List ports that belong to a given tenant, with specified router. router-show Show information of a given router. router-update Update router's information.
然后，要获取有关子命令（例如，用于标识云中路由器的 router-list）的特定详细信息，可键入以下命令：
# neutron help router-list