!7

p {
  for (S s : ll("abc", "", "-9"))
    ok(s);
  for (fS s : ll("|bla", ">dev", "<dev", "&", "`"))
    assertFail(r { noUnixTricks(s) });
  print("OK");
}

svoid ok(S s) {
  assertEquals(s, noUnixTricks(s));
}