Ubuntu Manpage: tree - list contents of directories in a tree-like format.

NAME

       tree - list contents of directories in a tree-like format.

SYNOPSIS

       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]  [--hyperlink]
       [--scheme[=]schema] [--authority[=]hostname] [--opt-toggle] [--version] [--help] [--] [directory ...]

DESCRIPTION

       Tree is a recursive directory listing program that produces a depth indented listing of files,  which  is
       colorized  ala  dircolors  if  the  LS_COLORS  environment variable is set and output is to tty.  With no
       arguments, tree lists the files in the current directory.  When directory arguments are given, tree lists
       all the files and/or directories found in the given directories each in turn.  Upon completion of listing
       all files/directories found, tree returns the total number of files and/or directories listed.

       By default, when a symbolic link is encountered, the path that the symbolic link  refers  to  is  printed
       after the name of the link in the format:

           name -> real-path

       If  the  `-l'  option is given and the symbolic link refers to an actual directory, then tree will follow
       the path of the symbolic link as if it were a real directory.

OPTIONS

       Tree understands the following command line switches:

LISTING OPTIONS

-a All files are printed. By default tree does not print hidden files (those beginning with a dot
`.'). In no event does tree print the file system constructs `.' (current directory) and `..'
(previous directory).

-d List directories only.

-l Follows symbolic links if they point to directories, as if they were directories. Symbolic links
that will result in recursion are avoided when detected.

-f Prints the full path prefix for each file.

-x Stay on the current file-system only. Ala find -xdev.

-L level
Max display depth of the directory tree.

-R Recursively cross down the tree each level directories (see -L option), and at each level
outputting to a file named 00Tree.html (ala -o).

-P pattern
List only those files that match the wild-card pattern. You may have multiple -P options. Note:
you must use the -a option to also consider those files beginning with a dot `.' for matching.
Valid wildcard operators are `*' (any zero or more characters), `**` (any zero or more characters
as well as null /'s, i.e. /**/ may match a single /), `?' (any single character), `[...]' (any
single character listed between brackets (optional - (dash) for character range may be used: ex:
[A-Z]), and `[^...]' (any single character not listed in brackets) and `|' separates alternate
patterns. A '/' at the end of the pattern matches directories, but not files.

-I pattern
Do not list those files that match the wild-card pattern. You may have multiple -I options. See
-P above for information on wildcard patterns.

--gitignore
Uses git .gitignore files for filtering files and directories. Also uses $GIT_DIR/info/exclude if
present.

--gitfile[=]file
Use file explicitly as a gitignore file.

--ignore-case
If a match pattern is specified by the -P or -I option, this will cause the pattern to match
without regard to the case of each letter.

--matchdirs
If a match pattern is specified by the -P option, this will cause the pattern to be applied to
directory names (in addition to filenames). In the event of a match on the directory name,
matching is disabled for the directory's contents. If the --prune option is used, empty folders
that match the pattern will not be pruned.

--metafirst
Print the meta-data information at the beginning of the line rather than after the indentation
lines.

--prune
Makes tree prune empty directories from the output, useful when used in conjunction with -P or -I.
See BUGS AND NOTES below for more information on this option.

--info Prints file comments found in .info files. See .INFO FILES below for more information on the
format of .info files.

--infofile[=]file
Use file explicitly as a info file.

--noreport
Omits printing of the file and directory report at the end of the tree listing.

--charset[=]charset
Set the character set to use when outputting HTML and for line drawing.

--filelimit[=]#
Do not descend directories that contain more than # entries.

--timefmt[=]format
Prints (implies -D) and formats the date according to the format string which uses the strftime(3)
syntax.

-o filename
Send output to filename.

FILE OPTIONS

-q Print non-printable characters in filenames as question marks instead of the default.

-N Print non-printable characters as is instead of as escaped octal numbers.

-Q Quote the names of files in double quotes.

-p Print the file type and permissions for each file (as per ls -l).

-u Print the username, or UID # if no username is available, of the file.

-g Print the group name, or GID # if no group name is available, of the file.

-s Print the size of each file in bytes along with the name.

-h Print the size of each file but in a more human readable way, e.g. appending a size letter for
kilobytes (K), megabytes (M), gigabytes (G), terabytes (T), petabytes (P) and exabytes (E).

--si Like -h but use SI units (powers of 1000) instead.

--du For each directory report its size as the accumulation of sizes of all its files and sub-
directories (and their files, and so on). The total amount of used space is also given in the
final report (like the 'du -c' command.) This option requires tree to read the entire directory
tree before emitting it, see BUGS AND NOTES below. Implies -s.

-D Print the date of the last modification time or if -c is used, the last status change time for the
file listed.

-F Append a `/' for directories, a `=' for socket files, a `*' for executable files, a `>' for doors
(Solaris) and a `|' for FIFO's, as per ls -F

--inodes
Prints the inode number of the file or directory

--device
Prints the device number to which the file or directory belongs

SORTING OPTIONS

       -v     Sort the output by version.

       -t     Sort the output by last modification time instead of alphabetically.

       -c     Sort the output by last status change instead of alphabetically.  Modifies the -D option (if used)
              to print the last status change instead of modification time.

       -U     Do not sort.  Lists files in directory order. Disables --dirsfirst.

       -r     Sort the output in reverse order.  This is a meta-sort that alters the above sorts.   This  option
              is disabled when -U is used.

       --dirsfirst
              List  directories  before  files. This is a meta-sort that alters the above sorts.  This option is
              disabled when -U is used.

       --filesfirst
              List files before directories. This is a meta-sort that alters the above sorts.   This  option  is
              disabled when -U is used.

       --sort[=]type
              Sort  the  output  by  type  instead  of  name. Possible values are: ctime (-c), mtime (-t), size,
              version (-v) or none (-U).

GRAPHICS OPTIONS

       -i     Makes tree not print the indentation lines, useful when used in conjunction with  the  -f  option.
              Also removes as much whitespace as possible when used with the -J or -X options.

       -A     Turn on ANSI line graphics hack when printing the indentation lines.

       -S     Turn  on  CP437  line  graphics  (useful  when using Linux console mode fonts). This option is now
              equivalent to `--charset=IBM437' and may eventually be depreciated.

       -n     Turn colorization off always, over-ridden by the -C option, however  overrides  CLICOLOR_FORCE  if
              present.

       -C     Turn  colorization  on  always,  using  built-in  color  defaults  if the LS_COLORS or TREE_COLORS
              environment variables are not set.  Useful to colorize output to a pipe.

XML/JSON/HTML/HYPERLINKS OPTIONS

-X Turn on XML output. Outputs the directory tree as an XML formatted file.

-J Turn on JSON output. Outputs the directory tree as a JSON formatted array.

-H [-]baseHREF
Turn on HTML output, including HTTP references. Useful for ftp sites. baseHREF gives the base ftp
location when using HTML output. That is, the local directory may be `/local/ftp/pub', but it must
be referenced as `ftp://hostname.organization.domain/pub' (baseHREF should be
`ftp://hostname.organization.domain'). If baseHREF begins with a dash (-), then the dash is
removed and indicates that tree should remove the first directory name from the href URL. Hint:
don't use ANSI lines with this option, and don't give more than one directory in the directory
list. If you wish to use colors via CSS style-sheet, use the -C option in addition to this option
to force color output.

--hintro[=]file
Use file as the HTML intro in place of the default one. Use an empty file or /dev/null to
eliminate the intro altogether.

--houtro[=]file
Use file as the HTML outro in place of the default one. Use an empty file or /dev/null to
eliminate the outro altogether.

-T title
Sets the title and H1 header string in HTML output mode.

--nolinks
Turns off hyperlinks in HTML output.

--hyperlink
Enable OSC 8 terminal hyperlinks for terminals that support them. See BUGS AND NOTES below.

--scheme[=]schema
Sets the schema used in the OSC 8 hyperlinks. The default schema is 'file://'. If the schema
omits the colon (:), then :// will be appended to the schema.

--authority[=]hostname|authority
Sets the authority (hostname) to use for the OSC 8 hyperlinks. By default the local hostname of
the machine as returned by gethostname() is used as the authority. A dot (.) or a set of ""'s,
sans '=', (i.e. the empty string) can be used to indicate a null authority.

INPUT OPTIONS

       --fromfile
              Reads a directory listing from a file rather than the file-system.  Paths provided on the  command
              line  are  files  to read from rather than directories to search.  The dot (.) directory indicates
              that tree should read paths from standard input. NOTE: this  is  only  suitable  for  reading  the
              output of a program such as find, not 'tree -fi' as symlinks are not distinguished from files that
              simply contain ' -> ' as part of the filename unless the --fflinks option is used.

       --fromtabfile
              Like  --fromfile, tree reads a directory tree from a text file where the files are tab indented in
              a tree like format to indicate the directory nesting level.

       --fflinks
              Processes symbolic link information found in a file, as from the output of 'tree -fi  --noreport'.
              Only  the  first  occurrence of the string ' -> ' is used to denote the separation of the filename
              from the link.

MISC OPTIONS

       --opt-toggle
              Enables option "toggling".  Turns on the ability to toggle options such as -a, -h, etc.  Useful to
              add to an alias when you wish to disable options enabled in the alias.

       --help Outputs a verbose usage listing.

       --version
              Outputs the version of tree.

       --     Option processing terminator.  No further options will be processed after this.

.INFO FILES

       .info files are similar to .gitignore files, if a .info file is found while scanning a  directory  it  is
       read  and  added  to a stack of .info information. Each file is composed of comments (lines starting with
       hash marks (#),) or wild-card patterns which may match a file relative to the directory the .info file is
       found in.  If a file should match a pattern, the tab indented comment that follows the pattern is used as
       the file comment.  A comment is terminated by a non-tab indented line. Multiple patterns, each to a line,
       may share the same comment.

FILES

       /etc/DIR_COLORS          System color database.
       ~/.dircolors             Users color database.
       .gitignore               Git exclusion file
       $GIT_DIR/info/exclude    Global git file exclusion list
       .info                    File comment file
       /usr/share/finfo/global_info  Global file comment file

ENVIRONMENT

       LS_COLORS      Color information created by dircolors
       TREE_COLORS    Uses this for color information over LS_COLORS if it is set.
       TREE_CHARSET   Character set for tree to use in HTML mode.
       CLICOLOR       Enables colorization even if TREE_COLORS or LS_COLORS is not set.
       CLICOLOR_FORCE Always enables colorization (effectively -C)
       NO_COLOR       Disable colorization (effectively -n) (see https://no-color.org/)
       LC_CTYPE       Locale for filename output.
       LC_TIME        Locale for timefmt output, see strftime(3).
       TZ             Timezone for timefmt output, see strftime(3).
       STDDATA_FD     Enable the stddata feature, optionally set descriptor to use.

AUTHOR

       Steve Baker (Steve.Baker.llc@gmail.com)
       HTML output hacked by Francesc Rocher (rocher@econ.udg.es)
       Charsets and OS/2 support by Kyosuke Tokoro (NBG01720@nifty.ne.jp)

BUGS AND NOTES

Tree does not prune "empty" directories when the -P and -I options are used by default. Use the --prune
option.

The -h and --si options round to the nearest whole number unlike the ls implementations which rounds up
always.

Pruning files and directories with the -I, -P and --filelimit options will lead to incorrect
file/directory count reports.

The --prune and --du options cause tree to accumulate the entire tree in memory before emitting it. For
large directory trees this can cause a significant delay in output and the use of large amounts of
memory.

The timefmt expansion buffer is limited to a ridiculously large 255 characters. Output of time strings
longer than this will be undefined, but are guaranteed to not exceed 255 characters.

XML/JSON trees are not colored, which is a bit of a shame. The jq utility can colorize the JSON however,
just not the filenames by file-type ala LS_COLORS.

OSC 8 hyperlinks may be poorly supported by your terminal. For my version of Konsole it is necessary to
set the schema to file: (no //) and use a null authority. It may also be necessary to spend 3.5 hours
finding the option to turn on hyperlinks.

Probably more.

As of version 2.0.0, in Linux, tree will attempt to automatically output a compact JSON tree on file
descriptor 3 (what I call stddata,) if present and the environment variable STDDATA_FD is defined or set
to a positive non-zero file descriptor value to use to output on. It is hoped that some day a better
Linux/Unix shell may take advantage of this feature, though BSON would probably be a better format for
this.