Building a Single Command Application
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When building a command line tool, you may not need to provide several commands.
In such case, having to pass the command name each time is tedious. Fortunately,
it is possible to remove this need by using default() when adding a command:

.. code-block:: python

from cleo import Application

command = GreetCommand()

app = Application()
app.add(command.default())

# this now executes the 'GreetCommand' without passing its name
app.run()