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

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

string secret(string $question, bool $fallback = true) Prompt the user

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

void line(string $string, string $style = null, null|int|string $verbosity = 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

OutputInterface getOutput() Get the output implementation.

bool hasArgument(string|int $name) Determine if the given argument is present

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