Namespace Symfony\Component\Console\Output

Classes summary
ConsoleOutput	ConsoleOutput is the default class for all CLI output. It uses STDOUT.
NullOutput	NullOutput suppresses all output.
Output	Base class for output classes.
StreamOutput	StreamOutput writes the output to a given stream.

Interfaces summary
ConsoleOutputInterface	ConsoleOutputInterface is the interface implemented by ConsoleOutput class. This adds information about stderr output stream.
OutputInterface	OutputInterface is the interface implemented by all Output classes.