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

void __construct(Filesystem $files)

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

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

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

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

OutputInterface getOutput() Get the output implementation.

void line(string $string) Write a string as standard output.

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

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