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    See stackoverflow.com/questions/8108249/… Commented Nov 12, 2011 at 23:19
  • It is very dangerious to execute a variable. First ensure your script sets it. and second ensure that the commands 'true' and 'false' really produce a true and false exist status. Someone may pass your script a 'exported function' call 'true'! Commented Aug 15, 2023 at 2:45