getopt

   A command-line parser that can be used by applications that
   follow UNIX command-line conventions.

   Format

     #include  <unistd.h> (X/Open, POSIX-1)

     #include  <stdio.h> (X/Open, POSIX-2)

     int getopt  (int argc, char * const argv[], const char *optstring);

     extern  char *optarg;

     extern  int optind, opterr, optopt;
 

Additional information available:

Arguments       Description     Return_Values   Example