3. File permissions

Each file has a set of permissions that control the kinds of access that users have to that file. The permissions for a file are also called its access mode. They can be represented either in symbolic form or as an octal number.

3.1 Structure of File Permissions		Structure of file permissions.
3.2 Symbolic Modes		Mnemonic permissions representation.
3.3 Numeric Modes		Permissions as octal numbers.