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 usage_command_group_short(const struct cmd_group *grp);
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 usage_command_group_short(const struct cmd_group *grp);