<p>Are there any command line interfaces to the DHCP settings in Mac OS X? I have found that inside System Profiler, the Network tab provides a lot of useful information, but I have not found any documentation about any command line equivalents.</p>

You should look at:
```
```
ifconfig(8)
netstat(1)
netintro(4)
```
```
The most important of these (netintro isn't actually a utility but rather introductory information on unix networking) is ifconfig which is the command line tool used to configure the various network interfaces you may have installed on your machine (like your ethernet card and your airport card) as well as any virtual interfaces (like your loopback address and things like parallels).