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

char buf[1000];

void echo()
{
	while (read(0, buf, 1) != 0) {
		write(1, buf, 1);
	}
		
}

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

  int ret;
  
  if (argc == 1) 
    echo();
  else {
       
    for (i=1; i<argc; i++) {
      ret = close(0);
      if (ret == -1) {
	      printf("close 0 failed\n");
      }
      
      ret = open(argv[i], O_RDWR);
      if (ret == -1) {
	      printf("open %s\n failed", argv[i]);
      }

      echo();
    }
  }
}