$data_file = '/tmp/users.db';
$total_length = 0;
if (! ($dbh = dba_open($data_file,'r','gdbm'))) {
die("Can't open database $data_file");
}
$k = dba_firstkey($dbh);
while ($k) {
$total_length += strlen(dba_fetch($k,$dbh));
$k = dba_nextkey($dbh);
}
print "Total length of all passwords is $total_length characters.";
dba_close($dbh);
?>