More or less what you are after ;-)

use Term::ReadKey;
ReadMode 4;         # raw mode
END{ ReadMode 0 }   # restore mode

my @data = map{"$_\tjaph\n"}1..100;
my ($page, $line, $key) = (20,0,'');
clear_screen();

while( $line < @data ) {
    if ($line and 0 == $line % $page) {
        printf "--- More or Less (%d%%) ---\n", int(100*$line/@data);
        1 while not defined ($key=ReadKey(0.5));
        $line -= 2*$page if $key =~ m/b/i;
        $line = 0 if $line < 0;
      exit if $key =~ m/q/i;
        clear_screen();
    }
    print $data[$line++];
}

sub clear_screen { system($^O =~ m/Win32/ ? 'cls' : 'clear') }
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