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Understanding UNIX files

Files do not actually reside inside directories. A directory is a file that contains references to other files. The directory holds two pieces of information about each file:

• its filename
• an inode number which acts as a pointer to where the system can find the information it needs about this file.

Filenames are only used by the system to locate a file and its corresponding inode number. This correspondence is called a link.

To the system, the file is the inode number. Multiple filenames can be used to refer to the same file by creating a link between an inode and each of the filenames.

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