I've heard that scsh (The Scheme Shell) is good, but haven't tried it myself. Even though my web app is written in Scheme, I still have a few bash scripts.

I think chicken scheme is even nicer for that kinna stuff.

I have to say that I've found go to actually be pretty awesome as a scripting language, though I've not used it a lot for this purpose a lot myself. The type inference + straight-forward standard library helps a lot with it.