That is incorrect, '/etc/sysconfig/network-scripts/ifcfg-*' is a RedHat-ism and isn't even portable between all linux distros. As far as I know there is no standard file between unix and unix-like systems for this information. You can try /etc/hosts but that will only give you resolvable interfaces. Parsing the output of '/sbin/ifconfig' is more likely to be portable. (not that portability is the goal here, but we don't know what system your running on) SNMP (if you have it running) would be another possible means of getting interfaces addresses.