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

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

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

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

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

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

string choice(string $question, array $choices, string $default = null, mixed $attempts = null, bool $multiple = null)

void error(string $string, null|int|string $verbosity = null) Write a string

void comment(string $string) Write a string as comment output.

OutputInterface getOutput() Get the output implementation.