#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>

#define	K	1024

void usage(void)
{
  printf("Usage: mv <src> <dst>\n");
  exit(0);
}
void help(void)
{
  printf("Usage: mv <src> <dst>\n");
  printf("Options:\n");
  printf(" --help	Prints this help\n");
  exit(0);
}

int main(int argc, char *argv[])
{
  if (argc < 2) usage();
  if (argc == 2 && strcmp(argv[1], "--help") == 0) help();
  if (argc < 3) usage();

  if (rename(argv[1], argv[2]) < 0) {
    perror("rename");
    return 1;
  }
  return 0;
}