That worked really well with one caveat. It doesn't work in a BEGIN; I get the error 
Undefined subroutine &main::x called at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

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But if I save it to a script it works nicely 
$_ = '-' x (1024*1024*300);

while( <> ) {
  print and next if length($_)==1001; 
  print STDERR $_;
}

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perl maxwellsfilter.pl suspect.txt > goodrecs.txt 2> badrecs.txt

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The odd thing (to me) is that it converts the line endings from Unix to Windows.. I didn't think it would that without using "\n" in the print.

Also, I now realize that with $|++ it did write complete records, but because it converted the line endings the record length changed from 1001 to 1002.

In reply to Re^2: Thrashing on very large lines by Anonymous Monk
in thread Thrashing on very large lines by chr1so

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