Unit conversion program?

[Modulok]

List,

Is there a command-line program which does unit conversions between SI
and other unit forms? Perhaps something similar to Google's feature?
For example:

    foo at bar> baz 41.5c to f
    106.7

    foo at bar> baz 190lbs to kg
    86.1825503

As well as for other associated units? I could write one in python
pretty easily, but just thought I'd check before re-inventing the
wheel.

Thanks.
-Modulok-