zsu
zsu is a Perl script that:
- updates the serial numbers of DNS zone files;
- tries to increment the DNS zone serial number to a sensible value,
based on the existing value and today's date;
- can do batch updates, especially as a part of a more general zone
file maintenance system.
You can get this at CPAN, in directory
/authors/id/A/AZ/AZS/zsu/
or download from here:
Copyright 1994-2004 by András Salamon
<andras@dns.net>