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4.7   Commands

A module that interacts with the user usually defines a number of commands, which can be invoked by the user from the command line. Commands can be bound to a specific namespace (i.e., a class or an interface) or to the global namespace.

• Commands bound to classes are used to manipulate individual instances of that class. For example, most devices have a status command that prints the state of the device.
• Commands bound to interfaces can be used on all objects implementing that interface. For example, the log-level command is available to all objects implementing the log-object interface.
• Global commands can be used for things that do not pertain to a specific object. This is the case of commands like output-radix or print.

For more information about writing new commands, refer to chapter 7.

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