I don't think this is necessarily quicker. But it only ever has one filehandle open.
{
local $/ = "\\/n";
my $file_no = 1;
open my $fh, '>', "file$file_no" or die $!;
while (<>) {
print $fh, $_;
unless ($. % 1000) {
close $fh;
$file_no++;
open $fh, '>', "file$file_no" or die $!;
}
}
}
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