In addition to kyle's comment, you should note that ++$filename uses Perl magic to generate a sequence of file names. Unless you add a few digits to the end of the 'seed' file name the result may be other than you expect. Try running the following:

my $fn = 'xxx0';

print ++$fn, ' ' for 1 .. 11;
print "\n";

$fn = 'xx00';
print ++$fn, ' ' for 1 .. 11;

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Perl reduces RSI - it saves typing

In reply to Re^3: split one file into many on finding a new line by GrandFather
in thread split one file into many on finding a new line by smarter_aries

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