[GRASSLIST:3573] How to resample and get a max value?

[Terry Duell]

Hullo,
I have an interesting problem which one of you more experienced GRASS
users may have the answer to.
I want to resample a raster map to a lower resolution (eg 100m down to
1000m), but in doing so I want to use the max value in the 100m raster
within the boundaries of each 1000m cell.
I have a suspicion that r.mapcalc might be the only way...but the 'how
to' currently eludes me.

Regards,
Terry Duell