17 library(unix): Unix specific operations
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Availability::- use_module(library(unix)).(can be autoloaded)
Source[det]fork_exec(+Command)
Fork (as fork/1) and exec (using exec/1) the child immediately. This behaves as the code below, but bypasses the check for the existence of other threads because this is a safe scenario. 
fork_exec(Command) :-
      (   fork(child)
      ->  exec(Command)
      ;   true
      ).