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 */
int getopt(int nargc, char *const nargv[], const char *ostr);
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 */
int getopt(int nargc, char *const nargv[], const char *ostr);