nuttx/Documentation/applications/examples/hello/index.rst

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=====================
``hello`` Hello World
=====================
This is the mandatory, "Hello, World" example. It is little more than
``examples/null`` with a single ``printf`` statement. Really useful only for
bringing up new NuttX architectures.
- ``CONFIG_NSH_BUILTIN_APPS`` Build the "Hello, World" example as an NSH
built-in application.