static L<Int> os_killAll(S pattern, O... _) {
  ret isWindows() ? windows_killAll(pattern, _) : unix_killAll(pattern, _);
}

static L<Int> os_killAll(F1<S, Bool> f, O... _) {
  ret isWindows() ? windows_killAll(f, _) : unix_killAll(f, _);
}