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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.
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