open(NEW, ">bigfile.txt") or die print "couldn't open big file\n";

print NEW "\"Column1\",\"Column2\",\"Column3\",\"Column4\",\"Column5\",\"Column6\",\"Column7\",\"Column8\",\"Column9\",\"Column10\",\"Column11\",\"Column12\",\"Column13\",\"Column14\",\"Column15\",\"Column16\",\"Column17\",\"Column18\"\n";

for($i=0;$i<75000;$i++) {

print NEW "\"NotImportant$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\",\"Testing$i\"\n"; }

for($j=0;$j<25000;$j++) {

print NEW "\"NotImportant$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\",\"Testing$j\"\n"; }

close(NEW);