random_choose.c

#include <time.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char** argv) {
  if (argc == 1) {
    fprintf(stderr, "USAGE: %s [options]\n", argv[0]);
    return 1;
  }
  srand(time(NULL));
  printf("%s\n", argv[(rand()%(argc-1))+1]);
  return 0;
}