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The tree command

The tree command in Linux recursively lists directories as tree structures. Each listing is indented according to its depth relative to root of the tree.

Examples:

1. Show a tree representation of the current directory.

tree

2. -L NUMBER limits the depth of recursion to avoid display very deep trees.

tree -L 2 /

Syntax:

tree  [-acdfghilnpqrstuvxACDFQNSUX]  [-L  level [-R]] [-H baseHREF] [-T title]
      [-o filename] [--nolinks] [-P pattern] [-I  pattern]  [--inodes]
      [--device] [--noreport] [--dirsfirst] [--version] [--help] [--filelimit #]
      [--si] [--prune] [--du] [--timefmt  format]  [--matchdirs]  [--from-file]
      [--] [directory ...]

Additional Flags and their Functionalities:

Flag	Description
-a	Print all files, including hidden ones.
-d	Only list directories.
-l	Follow symbolic links into directories.
-f	Print the full path to each listing, not just its basename.
-x	Do not move across file-systems.
-L #	Limit recursion depth to #.
-P REGEX	Recurse, but only list files that match the REGEX.
-I REGEX	Recurse, but do not list files that match the REGEX.
--ignore-case	Ignore case while pattern-matching.
--prune	Prune empty directories from output.
--filelimit #	Omit directories that contain more than # files.
-o FILE	Redirect STDOUT output to FILE.
-i	Do not output indentation.