r.mapcalc

Hello GRASS programmers. A couple of questions and/or
comments looking for input about r.mapcalc
(which I can't seem to find documented in the man pages).
(I am trying to tidy up a r.mapcalc program which uses
8 temporary raster layers to calculate a single raster
which is a function of 3 raster layers. Seems just a tad
wasteful).

        Hi Gordon,

        there's a r.mapcalc tutorial and extensive description
        which should be in /grass4.1/documents on moon.cecer.army.mil
        (look for files mapcalc-algebra.ps.Z, mapcalc.ps.Z, and
        mapcalc.txt.Z)

        In case you can't locate those files (I'm currently having trouble to
        connect to moon), they're also on
        ftp://ftp.informatik.uni-kiel.de\
        /pub/packages/grass/grass4.1/documents/

        Martin