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mac-resize-launchpad.sh

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+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