#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_APPEND,0666);
   
    FILE *f = fopen(argv[1],"w");

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

    //char potato[] = "potato";
    //write to file
    //write(fd, potato, 6);
    char c = 'p';
    fputs(c, f);
    fclose(f);
    //close(fd);
    return 0;
}