mac上使用imagealpha命令对图片进行压缩批处理

#! /bin/bash


#BASE_DIR="/Users/jiading/Documents/basepng";
#OUTPUT_DIR="/Users/jiading/Documents/output";
BASE_DIR="/Users/jiading/Documents/SwordsmanApp/art/序列帧动画/实验-分段版/9_选择迷你板固定";
OUTPUT_DIR="/Users/jiading/Documents/SwordsmanApp/art/序列帧动画/实验-分段版output最强压缩9";

CUR_READ_DIR="";
CUR_WRITE_DIR="";


dopng(){

readPng=$1;
writePng=$2;
fileName=$3;
fileName=${fileName%.*}".png";
echo "图片: "$fileName;

#speed  1-11

sudo /Applications/ImageAlpha.app/Contents/MacOS/pngquant -f $readPng -o $writePng"/$fileName" --quality 10 --speed 1 --nofs  --posterize 0


}


loopDir(){

#1 进入当前读取目录
cd $1;

   for file in *;
         do

localReadDir=$1;
localWriteDir=$2;


        if [ -d $file ];then
            echo $file" is a dir";

#2 进入一个目录
CUR_WRITE_DIR=$localWriteDir"/$file"

#3 创建对应新目录
echo "创建目录："$CUR_WRITE_DIR;
mkdir $CUR_WRITE_DIR

#4 进入下一级遍历
loopDir $localReadDir"/$file" $localWriteDir"/$file"

#5 下一级遍历完之后回到当前目录
cd $1;

        elif [ -f $file ];then


        dopng $localReadDir"/$file" $localWriteDir "$file"

        fi

        done

}

main(){

#1,删掉旧目录
if [ -d $OUTPUT_DIR ];then
echo "ouput目录已存在，立马删除";
rm -rf $OUTPUT_DIR
fi

#2,创建output跟目录
mkdir $OUTPUT_DIR


#3,开始遍历读取
CUR_READ_DIR=$BASE_DIR
CUR_WRITE_DIR=$OUTPUT_DIR
loopDir $CUR_READ_DIR $CUR_WRITE_DIR

echo "=-=-=-压缩完成=-=-=-="
}

main