apt-get install problem

[gene heskett]

Greetings people;

I have a deb (openscam, a graphics preview that converts rs-274D gcode into 
a preview of what the milling machine would carve when that code is 
executed by this openscam program) package sitting in 
/var/cache/apt/archives that I would like to install.  However apt-get 
insists on telling me that this file does not exist even when I give apt-
get the full pathlist/name.deb.

I don't use apt enough to be well versed in its cli nuances, doing the 
maintenance with synaptic 99% of the time, so what option do I give it to 
make it use this already downloaded package?

Thanks.

Cheers, Gene
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