New features in the fish shell

Seconded. It's very strange at first sight, but it's a really interesting reimagining of the shell idea: even the bits that look crazy (ls is a builtin?!) make sense later on when it becomes clear that you can do things like cd into tree-structured text files (a branch of a JSON file, say) and ls them and edit them on the fly :)

I don't think it's a good login shell but for popping into to dig around at structured text it's ever so much nicer than sed/awk oneliners a lot of the time.