tree(1) - list contents of directories in a tree-like format
--help Outputs a verbose usage listing.
       Outputs the version of tree.
-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.
-f     Prints the full path prefix for each file.
-i     Makes tree not print the indentation lines, useful when used in conjunction with the -f option.
-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.
-x     Stay on the current file-system only.  Ala find -xdev.
-P pattern
       List only those files that match the wild-card pattern.  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 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.
-I pattern
       Do not list those files that match the wild-card pattern.
       Omits printing of the file and directory report at the end of the tree listing.
-p     Print the file type and permissions for each file (as per ls -l).
-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), terrabytes (T), petabytes (P) and exabytes (E).
-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.
-D     Print the date of the last modification time for the file listed.
       Prints the inode number of the file or directory
       Prints the device number to which the file or directory belongs
-F     Append  a  `/'  for  directories, a `=' for socket files, a `*' for executable files and a `|' for
       FIFO's, as per ls -F
-q     Print non-printable characters in filenames  as  question  marks  instead  of  the  default  caret
-N     Print non-printable characters as is instead of the default carrot notation.
-v     Sort the output by version.
-r     Sort the output in reverse alphabetic order.
-t     Sort the output by last modification time instead of alphabetically.
       List directories before files.
-n     Turn colorization off always, over-ridden by the -C option.
-C     Turn  colorization  on always, using built-in color defaults if the LS_COLORS environment variable
       is not set.  Useful to colorize output to a pipe.
-A     Turn on ANSI line graphics hack when printing the indentation lines.
-S     Turn on ASCII line graphics (useful when using linux console  mode  fonts).  This  option  is  now
       equivalent to `--charset=IBM437' and will eventually be depreciated.
-L level
       Max display depth of the directory tree.
--filelimit #
       Do not descend directories that contain more than # entries.
-R     Recursively  cross  down  the  tree  each  level  directories (see -L option), and at each of them
       execute tree again adding `-o 00Tree.html' as a new option.
-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'). 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 CCS  stylesheet,  use
       the -C option in addition to this option to force color output.
-T title
       Sets the title and H1 header string in HTML output mode.
--charset charset
       Set the character set to use when outputting HTML and for line drawing.
       Turns off hyperlinks in HTML output.
-o filename
       Send output to filename.