public void register(Command command) {
		Preconditions.checkArgument(command != null, "Parameter 'command' must not be [" + command + "]");
		register(command.name(), command);
	}
public void register(Command command) {
		Preconditions.checkArgument(command != null, "Parameter 'command' must not be [" + command + "]");
		register(command.name(), command);
	}
public void register ( Command command ) { Preconditions . checkArgument ( command != null , "Parameter 'command' must not be [" + command + "]" ) ; register ( command . name ( ) , command ) ; }
Registers the specified command instance into the shell.

@param command Command to be registered.
Registers the specified command instance into the shell .