extern char * basename(const char *filename);

extern char *dirname(const char *path);

extern int	opterr,	 /* if error message should be printed */
	optind ,		 /* index into parent argv vector */
	optopt,			 /* character checked for validity */
	optreset;		 /* reset getopt */
extern char	*optarg; /* argument associated with option */


extern int getopt(int nargc, char * const *nargv, const char *ostr);