tree is a unix tool that can be used to list directories and/or files or only directories in a structured format.
How to use tree
# syntax "options" and "directory" is optionaltree<options><directory>tree./# show all files/directory, starting from the current directory you're in.tree-d./# show all directory, starting from the current directory you're in.tree-a./# show all files, starting from the current directory you're in.tree-F./# Appends '/', '=', '*', '@', '|' or '>' as per ls -F.tree--inodes./# print inode number of each file