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

using namespace std;
using MyNumberT = short;

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

    if(argc != 2) {
       cout << "USAGE " << argv[0] << "  filename" << endl;
       return 1;
    }

    int fd{open(argv[1], O_RDONLY)};

    if (fd == -1) {
       perror("\tError open:");
    }

    char c;

    while(read(fd, &c, 1) > 0) {
        cout << c;
    }

    close(fd);
    return 0;
}