批量修改文件后缀名

脚本名称：fileext.sh

#!/bin/bash                                                                          # 改变目录中的后缀名！！！

read -p "Old extension: " oldext
read -p "New extension: " newext
read -p "The directory: " dir
cd $dir

for file in $(ls $idr | grep .$oldext)
do
name=$(ls $file | cut -d. -f1)
mv $file ${name}.$newext
echo "$name.$oldext =======>$name.$newext"
done
echo "All file has been modified."

执行结果如下：
    $chmod u+x fileext.sh
    $./fileext.sh
    Old extension: JPG
    New extension: jpg
    The directory: 图片
    IMG1.JPG====>IMG1.jpg
    IMG2.JPG====>IMG2.jpg
    All file has been modified.