xtex.org

I wanted to split up an IP address in BASH so I could use it in my pppd ip-up script to check for a certain DNS server. Because the DNS server itself seemed to change a lot, I just wanted to check on the first three quads.

Assuming the IP address comes in on $DNS1 (as it does in /etc/ppp/ip-up):

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DNSIP=(${DNS1//./ });
#IPADDRESS=${DNSIP[0]}.${DNSIP[1]}.${DNSIP[2]}.${DNSIP[3]}