批量修改文件名

for name in `ls *.crt`
do
    #FILENAME='_COM.crt'
    newfile=`echo $name | sed "s/_/./g"`
    mv $name $newfile
done


for name in `ls`
do
    newfile=`echo $name | sed "s/COM/com/g"`
    mv $name $newfile
done


# 变量法
    #FILENAME='_COM.crt'
https://zhidao.baidu.com/question/1737619248395625147.html

# Sed 忽略 大小写
https://blog.csdn.net/weixin_34088583/article/details/91710189