Dennis Newbold <dennisn / pe.net> wrote in message news:<Pine.GSO.3.96.1020520090823.3149A-100000 / shell2>...
> Does anyone know of, or has written a Ruby extension implementing the
> ZModem data transfer protocol?  Alternatively, does anyone know of a
> binary implementation of ZModem that I can "wrap" in order to access
> it from Ruby?  This is for a utility which will be packaged with a
> commercial product, so "personal/academic use only" licensing restrictions
> will make it of no use / interest to me.  Thanks for any help / pointers
> you can give me.
> 

You can try lrzsz - this is a derivative of the original public-domain
rz/sz code now available under the GPL (which may also not be what you
want for a commercial product....)

http://www.ohse.de/uwe/software/lrzsz.html

PaulC