I wonder why it took until today for me to run into the tree command line utility. It prints your directory tree structure (so it’s useful for visualizing small-medium folder structures).

# Example: list directories up to 2 levels deep in my $GOPATH dir.
tree -L 2 -d
├── bin
├── pkg
│   └── linux_amd64
└── src
    ├── github.com
    ├── golang.org
    └── google.golang.org

7 directories