Quickly Go To the Parent Directory in Mac OS X
Buried in a nest of folders? You can quickly access the parent directory of any item or directory by hitting Command+↑ (Command + Up Arrow) anytime in a Mac OS X Finder window.
You’ll immediately go one level up to the directory containing the file or folder, which Mac OS X refers to as the “Enclosing Folder”. This is basically the GUI equivalent to typing “cd ..” at the command line, something that should be familiar to anyone with experience in the terminal.