#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>  //errno -l
 
int main(int argc, char *argv[]){
    if(argc < 2){
        fprintf(stderr, "Usage %s filename\n", argv[0]);
        return 1;
    }

    int fd = open(argv[1], O_RDONLY);
    //printf("fd was %d\n", fd);
    if (fd < 0) {
        fprintf(stderr,"Could not open file %s: ",argv[1]);
        perror("");
        return 1;
    }

    unsigned char c;

    //long
    while (read(fd, &c, 1) > 0){
        printf("%c", c);
    }
   

    close(fd);
  
    return 0;
}