#include int main(int argc, char **argv) { if (argc != 2) errx(-1, "usage: %s \n", argv[0]); char *f = argv[1]; int fd; fd = open(f, O_CREAT, 0600); if (fd < 0) err(fd, "open"); fd = close(fd); if (fd) err(fd, "close"); return 0; }