Linux VS Solaris
I support Linux and multiple flavors of Unix. The Unix I have the most experience with as of late is Solaris. Although they are familiar they have key differences. I like how most Linux's have standardized on the /etc/sysconfig directories. Having one repository to edit in order to change the network config on a machine is nice. In Linux you edit /etc/sysconfig/network to change the hostname and default gateway. You edit /etc/sysconfig/network-scripts/ifcfg-eth? to edit your IP configuration. Also to stay true to the Unix platform you edit /etc/hosts on Solaris you edit /etc/hosts, /etc/nodename, /etc/hostname.bg? (interface), /etc/inet/ipnodes and /etc/defaultrouter. It is not difficult to change the network config on either setup, but I think Linux has improved on this from Unix.