Use external grep over the file. That would be fastest in this case and use its result.
use v5.14;
my $noOfLines = `grep ^# testFile|wc -l`;
chomp($noOfLines);
if ($noOfLines){
<doSomething>
}

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In reply to Re: A fast way to do this? by gurpreetsingh13
in thread A fast way to do this? by Anonymous Monk

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