tree --help
usage: tree [-acdfghilnpqrstuvxACDFJQNSUX] [-L level [-R]] [-H baseHREF]
[-T title] [-o filename] [-P pattern] [-I pattern] [--gitignore]
[--gitfile[=]file] [--matchdirs] [--metafirst] [--ignore-case]
[--nolinks] [--hintro[=]file] [--houtro[=]file] [--inodes] [--device]
[--sort[=]<name>] [--dirsfirst] [--filesfirst] [--filelimit #] [--si]
[--du] [--prune] [--charset[=]X] [--timefmt[=]format] [--fromfile]
[--fromtabfile] [--fflinks] [--info] [--infofile[=]file] [--noreport]
[--version] [--help] [--] [directory ...]
------- 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.
--gitignore Filter by using .gitignore files.
--gitfile X Explicitly read gitignore file.
--ignore-case Ignore case when pattern matching.
--matchdirs Include directory names in -P pattern matching.
--metafirst Print meta-data at the beginning of each line.
--prune Prune empty directories from the output.
--info Print information about files found in .info files.
--infofile X Explicitly read info file.
--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.
-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).
--du Compute size of directories by their contents.
-D Print the date of last modification or (-c) status change.
--timefmt <f> Print and format time according to the format <f>.
-F Appends '/', '=', '*', '@', '|' or '>' as per ls -F.（就是在文件名最后附加一个代表文件类型的字符）
--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).
--filesfirst List files before directories (-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.
--hintro X Use file X as the HTML intro.
--houtro X Use file X as the HTML outro.
------- Input options -------
--fromfile Reads paths from files (.=stdin)
--fromtabfile Reads trees from tab indented files (.=stdin)
--fflinks Process link information when using --fromfile.
------- Miscellaneous options -------
--version Print version and exit.
--help Print usage and this help message and exit.
-- Options processing terminator.