#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>  

int main(int argc, char *argv[]){
    if(argc < 2){
        fprintf(stderr, "Usage %s filename\n", argv[0]);
        return 1;
    }

    //Open file to write
    //Try CREAT and TRUNC vs APPEND options

    int fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0666);
    //int fd = open(argv[1], O_WRONLY | O_CREAT | O_APPEND, 0666);
    //printf("fd was %d\n", fd);
    if (fd < 0) {
        fprintf(stderr,"Could not open file %s: ",argv[1]);
        perror("");
        return 1;
    }

    write(fd, "potato", 6);

    close(fd);
    return 0;
}