#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
  int d;
  char c;

  if (argc < 3) {
    printf("Usage: %s [file] number\nwhere number is one of:\n"
	"	0		(SYSV)\n"
	"	1		(HP-UX)\n"
	"	2		(NetBSD)\n"
	"	3		(GNU/Linux)\n"
	"	4		(GNU/Hurd)\n"
	"	5		(86Open)\n"
	"	6		(Solaris)\n"
	"	7		(Monterey)\n"
	"	8		(IRIX)\n"
	"	9		(FreeBSD)\n"
	"	10		(Tru64)\n"
	"	11		(Novell Modesto)\n"
	"	12		(OpenBSD)\n"
	"	97		(ARM)\n"
	"	255		(embedded)\n", argv[0]);
    return 1;
  }

  d = open(argv[1], O_RDWR);
  lseek(d, 7, SEEK_SET);
  c = atoi(argv[2]);
  write(d, &c, 1);

  close(d);
  return 0;
}