#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;
    }

    // open a file
    //int fd = open(argv[1],O_RDONLY);

    FILE *f = fopen(argv[1], "r");

    //if (fd < 0) {
    //    fprintf(stderr,"Could not open file %s: ",argv[1]);
    //    perror("");
    //    return 1;
    //}

    
    //long character-by-character
    //while (read(fd, &c, 1) > 0){
    //    printf("%c",c);
    //}
    int c;
    while ((c = fgetc(f))!=EOF){
        printf("%c",c);
    }

    fclose(f);
    //close(fd);
  
    return 0;
}