non-gui tool for parsing/generating cisco configs

I'm looking for a non-gui tool (or tools) for parsing and generating configs for cisco switches and routers that can be run from another process on unix systems. The configs I'll have are pretty simple, minimal routing, some port-specific commands, and basic host info. I've searched around the web and dug through the nanog archives (mostly to find there are few things, none of which match my current needs, and lots of people saying they need what I'm asking for and more). If anybody has pointers for the above, they're much appreciated. Thank you, -eric