Android drawable scaling script that uses bc and imagemagick

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#!/bin/bash

if [[ $# -lt 3 ]] ; then
	echo "usage: $0 <source dir> <output dir> <base dp size>"
	exit 1
fi

if [ ! -d $1 ] ; then
	echo "source directory doesn't exist"
	exit 1
fi

mkdir -p $2/drawable-ldpi/
mogrify -path $2/drawable-ldpi/ -resize $(echo $3*3/4 | bc)x$(echo $3*3/4 | bc) $1/*

mkdir -p $2/drawable-mdpi/
mogrify -path $2/drawable-mdpi/ -resize $(echo $3 | bc)x$(echo $3 | bc) $1/*

mkdir -p $2/drawable-hdpi/
mogrify -path $2/drawable-hdpi/ -resize $(echo $3*3/2 | bc)x$(echo $3*3/2 | bc) $1/*

mkdir -p $2/drawable-xhdpi/
mogrify -path $2/drawable-xhdpi/ -resize $(echo $3*2 | bc)x$(echo $3*2 | bc) $1/*

mkdir -p $2/drawable-xxhdpi/
mogrify -path $2/drawable-xxhdpi/ -resize $(echo $3*3 | bc)x$(echo $3*3| bc) $1/*

mkdir -p $2/drawable-xxxhdpi/
cp $1/* $2/drawable-xxxhdpi/.

Thx :):+1: