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5e895b28c7
os.execute() returns [3 variables](https://github.com/lua/lua/blob/f59e6a93c0ad38a27a420e51abf8f13d962446b5/lauxlib.c#L286). Capture the 2nd (e.g. "exit") and 3rd (e.g. 0) in addition to the first which would be merely `true` on success or `nil` on error.