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

int main(int argc, char** argv) {
    int opt;
    while((opt = getopt(argc, argv, ":h:m:s:")) != -1)
    {
        int num;
        switch(opt)
        {
            case 'h':
                if (sscanf(optarg, "%2d", &num) != 1 || (num < 0 || num > 23)) {
                    printf("rip hora\n");
                    break;
                }
                printf("hour: %d\n", num);
                break;
            case 'm':
                printf("minute: %s\n", optarg);
                break;
            case 's':
                printf("second: %s\n", optarg);
                break;
            case ':':
                printf("option needs a value\n");
                break;
            case '?':
                printf("unknown option: %c\n", optopt);
                break;
        }
    }

    return 0;
}