如：
tree 以树状图显示所有文件
tree -L N 以树状图显示所有文件，子文件夹显示到第 N 层
Ubuntu安装tree命令
sudo apt-get install tree
查看关于tree命令的帮助信息
linuxidc@linuxidc:~$ tree –help
usage: tree [-acdfghilnpqrstuvxACDFJQNSUX] [-H baseHREF] [-T title ]
[-L level [-R]] [-P pattern] [-I pattern] [-o filename] [–version]
[–help] [–inodes] [–device] [–noreport] [–nolinks] [–dirsfirst]
[–charset charset] [–filelimit[=]#] [–si] [–timefmt[=]<f>]
[–sort[=]<name>] [–matchdirs] [–ignore-case] [–] [<directory list>]
——- Listing options ——-
-a All files are listed.
-d List directories only.
-l Follow symbolic links like directories.
-f Print the full path prefix for each file.
-x Stay on current filesystem only.
-L level Descend only level directories deep.
-R Rerun tree when max dir level reached.
-P pattern List only those files that match the pattern given.
-I pattern Do not list files that match the given pattern.
–ignore-case Ignore case when pattern matching.
–matchdirs Include directory names in -P pattern matching.
–noreport Turn off file/directory count at end of tree listing.
–charset X Use charset X for terminal/HTML and indentation line output.
–filelimit # Do not descend dirs with more than # files in them.
–timefmt <f> Print and format time according to the format <f>.
-o filename Output to file instead of stdout.
——– File options ———
-q Print non-printable characters as ‘?’.
-N Print non-printable characters as is.
-Q Quote filenames with double quotes.
-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.
–si Like -h, but use in SI units (powers of 1000).
-D Print the date of last modification or (-c) status change.
-F Appends ‘/’, ‘=’, ‘*’, ‘@’, ‘|’ or ‘>’ as per ls -F.
–inodes Print inode number of each file.
–device Print device ID number to which each file belongs.
——- Sorting options ——-
-v Sort files alphanumerically by version.
-t Sort files by last modification time.
-c Sort files by last status change time.
-U Leave files unsorted.
-r Reverse the order of the sort.
–dirsfirst List directories before files (-U disables).
–sort X Select sort: name,version,size,mtime,ctime.
——- Graphics options ——
-i Don’t print indentation lines.
-A Print ANSI lines graphic indentation lines.
-S Print with CP437 (console) graphics indentation lines.
-n Turn colorization off always (-C overrides).
-C Turn colorization on always.
——- XML/HTML/JSON options ——-
-X Prints out an XML representation of the tree.
-J Prints out an JSON representation of the tree.
-H baseHREF Prints out HTML format with baseHREF as top directory.
-T string Replace the default HTML title and H1 header with string.
–nolinks Turn off hyperlinks in HTML output.
—- Miscellaneous options —-
–version Print version and exit.
–help Print usage and this help message and exit.
— Options processing terminator.
(1) 显示当前目录的树形结构
linuxidc@linuxidc:~/桌面/www.linuxidc.com/linuxidc.com$ tree
.
├── linuxidc.com
│ ├── linuxidc.com.png
│ └── www.linuxidc.com
├── linuxidc.com.deb
├── linuxidc.com.png
├── linuxidc.jpg
├── linuxidc.png
├── linuxidc.zip
└── 教程重要说明及更新链接点击这个文本.txt
2 directories, 7 files
(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 > linuxidc.com.txt
如下图
