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tree
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===
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树状图列出目录的内容
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## 说明
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**tree命令** 以树状图列出目录的内容。
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### 语法
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```
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tree(选项)(参数)
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```
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```bash
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------- 列表选项 -------
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-a # 显示所有文件和目录。
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-d # 先是目录名称而非文件。
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-l # 如遇到性质为符号连接的目录，直接列出该连接所指向的原始目录。
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-f # 在每个文件或目录之前，显示完整的相对路径名称。
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-x # 将范围局限在现行的文件系统中，若指定目录下的某些子目录，其存放于另一个文件系统上，则将该目录予以排除在寻找范围外。
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-L level # 限制目录显示层级。
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-R # Rerun tree when max dir level reached.
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-P pattern # <范本样式> 只显示符合范本样式的文件和目录名称。
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-I pattern # Do not list files that match the given pattern.
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--ignore-case # Ignore case when pattern matching.
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--matchdirs # Include directory names in -P pattern matching.
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--noreport # Turn off file/directory count at end of tree listing.
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--charset X # Use charset X for terminal/HTML and indentation line output.
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--filelimit # # Do not descend dirs with more than # files in them.
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--timefmt <f> # Print and format time according to the format <f>.
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-o filename # Output to file instead of stdout.
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-------- 文件选项 ---------
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-q # 用“？”号取代控制字符，列出文件和目录名称。
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-N # 直接列出文件和目录名称，包括控制字符。
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-Q # Quote filenames with double quotes.
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-p # 列出权限标示。
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-u # 列出文件或目录的拥有者名称，没有对应的名称时，则显示用户识别码。
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-g # 列出文件或目录的所属群组名称，没有对应的名称时，则显示群组识别码。
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-s # 列出文件和目录大小。
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-h # Print the size in a more human readable way.
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--si # Like -h, but use in SI units (powers of 1000).
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-D # 列出文件或目录的更改时间。
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-F # 在执行文件，目录，Socket，符号连接，管道名称名称，各自加上"*"，"/"，"@"，"|"号。
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--inodes # Print inode number of each file.
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--device # Print device ID number to which each file belongs.
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------- 排序选项 -------
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-v # Sort files alphanumerically by version.
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-t # 用文件和目录的更改时间排序。
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-c # Sort files by last status change time.
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-U # Leave files unsorted.
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-r # Reverse the order of the sort.
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--dirsfirst # List directories before files (-U disables).
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--sort X # Select sort: name,version,size,mtime,ctime.
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------- 图形选项 ------
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-i # 不以阶梯状列出文件和目录名称。
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-A # 使用ASNI绘图字符显示树状图而非以ASCII字符组合。
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-S # Print with CP437 (console) graphics indentation lines.
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-n # Turn colorization off always (-C overrides).
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-C # 在文件和目录清单加上色彩，便于区分各种类型。
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------- XML / HTML / JSON选项 -------
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-X # Prints out an XML representation of the tree.
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-J # Prints out an JSON representation of the tree.
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-H baseHREF # Prints out HTML format with baseHREF as top directory.
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-T string # Replace the default HTML title and H1 header with string.
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--nolinks # Turn off hyperlinks in HTML output.
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---- 杂项选项 ----
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--version # 输入版本信息。
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--help # 打印使用帮助信息。
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-- # Options processing terminator.
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```
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### 参数
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目录：执行tree指令，它会列出指定目录下的所有文件，包括子目录里的文件。
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### 实例
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列出目录`/private/` 第一级文件名
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```bash
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tree /private/ -L 1
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/private/
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├── etc
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├── tftpboot
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├── tmp
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└── var
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```
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忽略文件夹
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```bash
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tree -I node_modules # 忽略当前目录文件夹node_modules
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tree -P node_modules # 列出当前目录文件夹node_modules的目录结构
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tree -P node_modules -L 2 # 显示目录node_modules两层的目录树结构
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tree -L 2 > /home/www/tree.txt # 当前目录结果存到 tree.txt 文件中
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```
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忽略多个文件夹
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```bash
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tree -I 'node_modules|icon|font' -L 2
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```
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