As a note, there's a way to check for "lines which are composed only of spaces" that I find much more succinct:
print "Query: $line" if ($line =~ /\S/);
Or more generically:
next unless ($line =~ /\S/);
print "Query: $line";
"Not composed entirely of spaces" is equivalent to "contains a non-space character", at least in this context.
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