./r 1 2:10

r.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[]) {
  char *s;
  int i, n;
  for (i = 1; i < argc; i++) {
    n = (strchr(argv[i], ':')) ? strtol(s + 1, (char**) NULL, 10) : 32;
    srand(strtol(argv[i], (char**) NULL, 10));
    for (;n--;) {
      printf("%d ", rand());
    }
    putchar('\n');
  }
  return 0;
}