linux命令-tree

1.centos系统默认是没有tree命令的，需要安装。tree的安装命令：

sudo yum -y install tree     

2.tree -L N 其中N表示展示几级目录

[root@ipha-dev71-1 docker]# tree -L 1 /var/lib/docker/
/var/lib/docker/
├── builder
├── buildkit
├── containers
├── image
├── network
├── overlay2
├── plugins
├── runtimes
├── swarm
├── tmp
├── trust
└── volumes

12 directories, 0 files