A shell script to batch compress all images under a folder, based on ImageMagick.

compress.sh

#!/bin/bash
###
# @Author: Dorad, ddxi@qq.com
# @Date: 2023-04-22 00:04:43 +02:00
# @LastEditors: Dorad, ddxi@qq.com
# @LastEditTime: 2023-04-22 00:18:13 +02:00
# @FilePath: \compress.sh
# @Description:
#
# Copyright (c) 2023 by Dorad (ddxi@qq.com), All Rights Reserved.
###

# 输入文件夹路径和输出文件夹路径

# 获取输入参数
if [ $# -lt 2 ]; then
    echo "Usage: $0 input_dir output_dir <quality%>"
    exit 1
fi

if [ ! -d "$1" ]; then
    echo "Input dir $1 not exists"
    exit 1
fi

input_dir=$1
output_dir=$2
# 压缩后的图片质量百分比, 默认为 80
if [ -z "$3" ]; then
    quality=80
else
    quality=$3
fi

# 检查convert命令是否存在
if ! command -v convert &>/dev/null; then
    echo "convert command not found, please install ImageMagick first"
    exit 1
fi

# 遍历输入文件夹下所有图片文件
find $input_dir -type f -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' -o -iname '*.gif' | while read file; do
    # 创建输出文件夹的相同目录结构
    relative_path=${file#"$input_dir"}
    output_file="$output_dir/$relative_path"
    echo "Output file: $output_file"
    # 创建输出文件夹
    mkdir -p "${output_file%/*}"
    # 压缩图片并输出到相应的文件夹下
    convert "$file" -quality $quality "$output_file"
    echo "Compress $file, output to $output_dir/$file"
done

echo "Total files: $(find $input_dir -type f -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' -o -iname '*.gif' | wc -l)"
echo "Compressed files: $(find $output_dir -type f -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' -o -iname '*.gif' | wc -l)"
echo "Done!"