UNIX overview

The UNIX file system has a hierarchical tree structure. At the top of the tree is the root directory, /, from which all other files and subdirectories branch.

A directory is a special type of file that is an index to all of the files and subdirectories one level below it.

Select the topic of interest:

• filenames
• pathnames
• parent directories
• wildcards
• useful unix commands
• file permissions
• shell command interpreters