As long as you don't try to read the whole file into memory at once, you will be fine.

Just read a line at a time and open a new outputfile whenever you see that the size is too big and the current line starts with "100". Something like this:
while (defined $line = <$inputFileHandle>)

while ($line = <$inputFileHandle>)
{
  if ($sizeSoFar > 1e9 and $line =~ /^100/)
  {
    $outputFileName++;
    open $outputFileHandle, '>', $outputFileName or die "Cannot open $
+outputFilename for writing: $!\n";
    $sizeSoFar = 0;
  }
  print $outputFilehandle $line;
  $sizeSoFar += length($line);
}

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In reply to Re: Can I split a 10GB file into 1 GB sizes using my repeating data pattern by SuicideJunkie
in thread Can I split a 10GB file into 1 GB sizes using my repeating data pattern by Anonymous Monk

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