Hour 4. Working with Directories
UNIX uses a hierarchical structure for organizing files and directories, which is referred to as a directory tree. The tree has a single root node, slash (/); all other directories are contained below it.
Every directory, including /, can store both files and other directories. Every file is stored in a directory, and every directory, except /, is stored within a directory.
This is slightly different from the multi-root hierarchical structure used by Windows and Mac OS. In those operating systems, all devices (floppy disk drives, CD-ROMs, hard drives, and so on) are located at the same top-most level. The UNIX model is slightly different, but after you've adjusted to it, it is extremely convenient.
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