Use the following awk line to do this: r.stats -c <dem_layer> | awk 'BEGIN{countcells=0; adddems=0}\ {countcells += $2; adddems += $1*$2}\ END{print "The average is:",adddems/countcells}' You may modify it if you wish. Nalneesh Gaur, River Forecast Center, TULSA