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    You need || instead of && Commented Dec 3, 2015 at 18:43
  • The test is not "are any of the files not there", the test is "are none of the files there". Using || would execute the predicate if any of the files are not present, not if and only iff all of the files are not present. NOT( A AND B AND C) is the same as (NOT A) AND (NOT B) AND (NOT C); see the original question. Commented Dec 3, 2015 at 18:47
  • @DopeGhoti, cuonglm is right. It's if not (all files there) so when you split it up this way you need || instead of &&. See my first comment below my question itself. Commented Dec 3, 2015 at 18:51
  • 2
    @DopeGhoti: not (a and b) is the same as (not a) or (not b). See en.wikipedia.org/wiki/De_Morgan%27s_laws Commented Dec 3, 2015 at 18:52
  • 1
    It must be Thursday. I never could get the hang of Thursdays. Corrected, and I will leave my foot-in-mouth for posterity. Commented Dec 3, 2015 at 18:54