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sub foo {
  defined($file = <abc*>) or return;
  open(FH, $file) or die $!;
  ...
}

       A glob evaluates its (embedded) argument only when it is
       starting a new list.  All values must be read before it
       will start over.  In a list context this isn't important,
...
       context, however, the operator returns the next value each
       time it is called, or a undef value if you've just run
       out.