string ask(string $question, string $default = null) Prompt the user for

bool confirm(string $question, bool $default = false) Confirm a question

string askWithCompletion(string $question, array $choices, string $default = null)

string ask(string $question, string $default = null) Prompt the user for

string|array argument(string $key = null) Get the value of a command argument

string|array option(string $key = null) Get the value of a command option

int callSilent(string $command, array $arguments = array()) Call another

int call(string $command, array $arguments = array()) Call another console

int run(InputInterface $input, OutputInterface $output) Run the console

array options() Get all of the options passed to the command.