On OS X 10.9.5 my bash shell has the following environment variable set:


What is the purpose of this value? I am surprised there is no record of anybody asking this before.

  • 1
    See discussions.apple.com/thread/5559451, no answer there either. Interesting...
    – nohillside
    Commented Oct 4, 2014 at 20:58
  • I have __CHECKFIX1436934=1 in my ENV too. I note that the few search results that I find for this include it as part of programmers asking for help and listing their ENV related to the Go language, Python, SublimeText or Brew. I have all of these installed.
    – Lee Joramo
    Commented Oct 8, 2014 at 17:04

1 Answer 1


It comes from launch services, specifically this binary


and that environment variable seems to be inherited by many processes, as you can see with ps -Efax

1436934 looks like the number of digits in recent Apple "radar" bug numbers, so perhaps it refers to some value used internally for testing.

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