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An inode is a data structure on a traditional Unix-style file system such as UFS or ext3. An inode stores basic information about a regular file, directory, or other file system object.

Each and every file under Linux (and UNIX) has following attributes:

* File type (executable, block special etc) * Permissions (read, write etc) * Owner * Group * File Size * File access, change and modification time * File deletion time * Number of links (soft/hard) * Access Control List (ACLs)

All the above information is stored in an inode.

So, each file has an inode associated with it and an unique number called inode number.

This number is used to look up an entry in the inode table.

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