$totcalls += [ $layer3 =~ m/^\s*([0-9]+) Active/ ]->[0];
needlessly creates an array and a reference. Use
$totcalls += ( $layer3 =~ m/^\s*([0-9]+) Active/ )[0];

In reply to Re^2: avoid warnings in Copying and Substituting Simultaneously by ikegami
in thread avoid warnings in Copying and Substituting Simultaneously by mvcorrea

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