echo "::*** Enter [row number] (7 for MBA, 9 for iMac) or [leave blank] for default to 9"
read -p "***:: " ROWS
if [ "$ROWS" = "" ]
then
  ROWS=9
fi
defaults write com.apple.dock springboard-rows -int $ROWS

echo "::*** Enter [column number] (10 for MBA, 15 for iMac) or [leave blank] for default to 15"
read -p "***:: " COLS
if [ "$COLS" = "" ]
then
  COLS=15
fi
defaults write com.apple.dock springboard-columns -int $COLS

defaults write com.apple.dock ResetLaunchPad -bool true

killall Dock