-void usage(const char * const *usagestr) __attribute__((noreturn));
-void usage_command(const struct cmd_struct *cmd, int full, int err);
-void usage_command_group(const struct cmd_group *grp, int all, int err);
-
-void help_unknown_token(const char *arg, const struct cmd_group *grp) __attribute__((noreturn));
-void help_ambiguous_token(const char *arg, const struct cmd_group *grp) __attribute__((noreturn));
-
-void help_command_group(const struct cmd_group *grp, int argc, char **argv);
-