One of my sysadmin rules of thumb for deciding what to automate in scriptsand programs is this: automate where you can make mistakes. In particular,automate where you are specifying redundant information.

This will make more sense with an example, so let's talk aboutconfiguring iSCSI targets. We use static target configuration, whichmeans that you tell the system a target name and the IP address that itcan be found on; each iSCSI server has two IPs, so we configure each ofits targets twice, once