Show the contents of the current directory as a tree.

# To show files and directories with a depth of 'num' (where 1 means the current directory):
tree -L num

# To show directories only:
tree -d

# To show hidden files too:
tree -a

# To print human readable size of files:
tree -h

# To print the full path for each file:
tree -f

# To print the tree without lines and indentation. Useful when used with -f:
tree -i