It's closer to 
open(my $in, '<', $ARGV[0]) or die $!;
unlink($ARGV[0]);

open(my $out, '>', $ARGV[0]) or die $!;
while (<$in>) {
   s/\r\n/\n/;
   print($out $_);
}

[download]

In reply to Re^2: dos2ux shows cannot open file if it is greater than 2GB size by ikegami
in thread dos2ux shows cannot open file if it is greater than 2GB size by shan_emails

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