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Generate all xcode 5 app icon sizes from one original large icon
mkdir -p generated
for size in 29 $((29*2)) $((29*3)) $((40*2)) $((40*3)) 57 $((57*2)) $((60*2)) $((60*3)) 29 $((29*2)) 40 $((40*2)) 50 $((50*2)) 72 $((72*2)) 76 $((76*2)); do
sips -Z $size --out generated/$size.png sourceIcon.png
done
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