I would like to run BRL-CAD on Lenny (Debian). I'm using an i386 so it looks like I'll need to install from source. Never done this before. Can I get some help with what to type into the terminal?
Depending on how old your machine is, the 7.10.4 binary release should work just fine for you: http://downloads.sourceforge.net/brlcad/brlcad_7.10.4_ia32.tar.gz
Otherwise, if you download a source tarball, there are extensive instructions in the INSTALL file.