EX_NOPERM
err(EX_NOPERM, "setuid() failed");
err(EX_NOPERM, "-f flag");
errc(EX_NOPERM, EPERM,
errc(EX_NOPERM, EPERM,
errc(EX_NOPERM, EPERM,
err(EX_NOPERM, "-i interval too short");
err(EX_NOPERM, "-l flag");
err(EX_NOPERM,