#include <stdio.h>

main(int argc, char **argv)
{
  int fd1;
  int fd2;
  char c;
  int j;

  fd1 = atoi(argv[1]);
  fd2 = atoi(argv[2]);

  while (1) {
    j = read(fd1, &c, 1);
    if (j == 0) exit(0);
    if (j != 1) {
      fprintf(stderr, 
       "bad read from %d\n",  
        fd1);
      exit(1);
    }
    j = write(fd2, &c, 1);
    if (j != 1) {
      fprintf(stderr, 
       "bad write to %d\n", 
       fd2);
      exit(1);
    }
  }
}