void command_evaluate_to_void(struct attr *attr, char *expr, int **error);
char *command_evaluate_to_string(struct attr *attr, char *expr, int **error);
int command_evaluate_to_int(struct attr *attr, char *expr, int **error);
+int command_evaluate_to_boolean(struct attr *attr, char *expr, int **error);
void command_evaluate(struct attr *attr, char *expr);
void command_add_table_attr(struct command_table *table, int count, void *data, struct attr *attr);
void command_add_table(struct callback_list *cbl, struct command_table *table, int count, void *data);