You can use Tie::File to treat the file like an array, then use unshift to add to the beginning of the array

use Tie::File;

my $file = 'filename';

my @tiedfile;

my $new_content = "foo";  ## Whatever you want to prepend to the file

tie(@tiedfile, 'Tie::File', $file);

unshift(@tiedfile, $new_content);

untie(@tiedfile);
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If you need to add more than one line, you can get your new content into an array and loop through it:

foreach my $line (reverse(@new_content)) {
    unshift(@tiedfile, $line);
}
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