http://coolestguidesontheplanet.com/format-usb-external-disk-mac-osx-using-disk-utility/
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$tree
this command allows you to see the file structure in a pretty tree-like structure instead of just text
in order to install this on a mac: $brew install tree
brew is the command for the application called homebrew. It’s a package manager like apt-get, yum, etc.