Well I only started reading about Oil just now, but actually it seems to be the exact complement of Fish. That is, Fish intends to be a useful interactive shel

Well I only started reading about Oil just now, but actually it seems to be the exact complement of Fish. That is, Fish intends to be a useful interactive shell and if it also scriptable, that because you need scripting for it to be useful. Fish doesn't make a serious attempt being the language in which system scripts are programmed in. Oil on the other hand is a concerted effort to formalise and rigorously implement the language which existing system scripts are written in. The author believes that is a starting point for a good interactive shell -- but programming comes first.