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sub dacts
...
  return $n;
  1
}

Does a fork(2) system call to create a new process running the
same program at the same point.  It returns the child pid to the
parent process, C<0> to the child process, or C<undef> if the fork is
unsuccessful.  File descriptors (and sometimes locks on those descript
+ors)

MemTotal:       189248 kB
MemFree:          7540 kB
SwapTotal:      393156 kB
SwapFree:       380144 kB