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  1. extern char * basename (const char *filename);
  2. extern char *dirname(const char *path);
  3. extern int opterr, /* if error message should be printed */
  4. optind , /* index into parent argv vector */
  5. optopt, /* character checked for validity */
  6. optreset; /* reset getopt */
  7. extern char *optarg; /* argument associated with option */
  8. extern int getopt(int nargc, char * const *nargv, const char *ostr);