Shell語句可以直接寫在命令行上
for i in `ls`; do echo "$i\n"; done
注意用分號隔開
清除文件
1. > access.log
2. cat /dev/null > access.log
3. cp /dev/null access.log
4. echo > access.log
批量刪除
for i in `find /var/lib/docker/containers -name '*json.log'` ; do cat /dev/null> $i ; done