bool hasArgument(string|int $name) Determine if the given argument is present
OutputInterface getOutput() Get the output implementation.
string ask(string $question, string $default = null) Prompt the user for
int callSilent(string $command, array $arguments = array()) Call another
void line(string $string, string $style = null, null|int|string $verbosity = null)
void question(string $string, null|int|string $verbosity = null) Write
void error(string $string) Write a string as error output.
void warn(string $string, null|int|string $verbosity = null) Write a string
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