Port of perl's -M function to C

fileAgeInDays.c

#include <stdio.h>
#include <sys/stat.h>
#include <time.h>
int main(int argc, char **argv) {
    struct stat sb;
    int rv;

    rv = stat(argv[argc-1], &sb);
    fprintf(stdout, "%ld\n", (time(NULL)-sb.st_atime)/86400);
    return rv;
}

run log

$ clang ./fileAgeInDays.c -o timeInDays
$ ./timeInDays #  gives the file age in days
./timeInDays -- 1