What is “tree” Package?

Display directories as trees (with optional color/HTML output)
For more details: http://mama.indstate.edu/users/ice/tree/

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install tree.

  brew install tree

Now, use tree!