IPv6 addresses

[Chris Dennis]

Hello folks

I'm hacking together a quick script to parse the output from the 'ip' 
command on Linux, e.g.

$ ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
     inet 127.0.0.1/8 scope host lo
     inet6 ::1/128 scope host
        valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP 
qlen 1000
     link/ether 00:19:b9:06:4c:86 brd ff:ff:ff:ff:ff:ff
     inet 192.168.1.7/24 brd 192.168.1.255 scope global eth0
     inet6 2001:dead:beef:cafe::1/64 scope global dynamic
        valid_lft 86147sec preferred_lft 14147sec
     inet6 fe80::1/64 scope link
        valid_lft forever preferred_lft forever

-- which is straightforward.  But then I need to process the IPv6 
addresses to be able to extract subnet prefixes etc.

CPAN has so many IPv6-mangling modules that I don't know which to 
choose, or which will emerge as the best/most stable etc. in the future. 
  Certainly some of the ones I've looked at are badly written or badly 
documented or just plain broken.

Any recommendations?

cheers

Chris
-- 
Chris Dennis                                  cgdennis at btinternet.com
Fordingbridge, Hampshire, UK