#!/bin/bash # yum install ImageMagick # cd /img/dir for file in */*.jpg; do  to_middle_file="${file%.*}_m.${file##*.}"; //文件名加后缀 如 hello_m.jpg  to_small_file="${file%.*}_s.${file##*.}";  convert ${img} -resize 300x180! ${to_middle_file};  ls ${to_middle_file};  convert ${img} -resize 100x60! ${to_small_file};  ls ${to_small_file}; done # convert resize argument # 100x200       # width = 100, height = 200 # 300x          # width = 300, height = proportional # x300          # width = proportional, height = 300 # ! 表示强制转换大小,不加“!”会按照原图片比例压缩图片