Linux/Ubuntu tree 命令以树形结构显示文件夹目录结构

1、安装命令工具

sudo apt-get -y install tree

2、可以查看关于tree命令的帮助信息

$ tree --help
usage: tree [-adfghilnpqrstuvxACDFNS] [-H baseHREF] [-T title ] [-L level [-R]]
        [-P pattern] [-I pattern] [-o filename] [--version] [--help] [--inodes]
        [--device] [--noreport] [--nolinks] [--dirsfirst] [--charset charset]
        [--filelimit #] [<directory list>]
  -a            All files are listed.
  -d            List directories only.
  -l            Follow symbolic links like directories.
  -f            Print the full path prefix for each file.
  -i            Don't print indentation lines.
  -q            Print non-printable characters as '?'.
  -N            Print non-printable characters as is.
  -p            Print the protections for each file.
  -u            Displays file owner or UID number.
  -g            Displays file group owner or GID number.
  -s            Print the size in bytes of each file.
  -h            Print the size in a more human readable way.
  -D            Print the date of last modification.
  -F            Appends '/', '=', '*', or '|' as per ls -F.
  -v            Sort files alphanumerically by version.
  -r            Sort files in reverse alphanumeric order.
  -t            Sort files by last modification time.
  -x            Stay on current filesystem only.
  -L level      Descend only level directories deep.

3、使用方法（常用）

(1) 显示当前目录的树形结构

jianbao@jianbao-pc:/www/软件开发$ tree 
.
├── PPT
│   └── PHP性能监控与优化.pptx
├── 电子书
│   ├── Linux.环境C程序设计.徐诚.扫描版.pdf
│   └── UNIX环境高级编程（中文第三版）_扫描版.pdf
├── 视频
│   └── PHP_C扩展
│       ├── PHP扩展开发教程.mp4
│       ├── swoole第三节第4部分.mp4
│       ├── swoole视频教程第3节 swoole服务器的进程_线程模型.mp4
│       └── 其他
│           ├── swoole-chat第二节第二部分.mp4
│           ├── swoole-chat第二节第三部分.mp4
└── 手册
    └── php_enhanced_zh.chm

(2) 只查看当前第一级的目录和文件

$ tree -L 1

(3) 只查看当前第二级的目录和文件

$ tree -L 2

(4) 只查看当前第N级的目录和文件

$ tree -L N

(5) 把目录结构信息保存到文本中

$ tree -L 2 > /home/php-note.com/tree.txt