But, how do we know when the API is ready? We could send a request to one of the API's endpoints and see if it returns a result. However, this couples our script with the implementation of the API. A better way would be to check whether the API is actively listening to the server port. We can do this using the netstat utility, or its replacement, ss (which stands for socket statistics). Both commands are used to display network-related information such as open connections and socket ports:
$ netstat -lnt$ ss -lnt
For both commands, the -l flag will limit the results to only listening sockets, the -n flag will display all hosts and ports as numeric values (for instance, it'll output 127.0.0.1:631 instead ...
