NetBash is a drop in (think mvc mini profiler) extendable command line for your web application.
Maybe I should try to add something like this for the mods at DNK....;-)
The former, if it's not built in, would have to be created. I didn't look to see if it has any concept of pipes yet (which is what would make it incredibly useful), but as for commands needed for the site, it uses reflection to find the commands exposed.
I think it's more useful for power users because just like bash programming, it's sometimes easier to make a quick and dirty script.