Not that I could find. I created a text file with two lines, each approximate 665,000 characters in length. Then I did a 
open IN,"<bigline" || die;
while (<IN>) {
  print;
}
close IN;

[download]
and it seemed to have worked just fine. No doubt the line length is limited only by available memory.

In reply to Re: Limit to Line Length? by mr.nick
in thread Limit to Line Length? by Kozz

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