The import hack is the only thing I don't really like (I'd prefer the `from pbs import sh` syntax proposed elsewhere) -- and without reading the code... is pipi

The import hack is the only thing I don't really like (I'd prefer the `from pbs import sh` syntax proposed elsewhere) -- and without reading the code... is piping really piping, or will the function composition example actually consume the first command result fully first? Anyway, this is a great idea. :)