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Each file has a set of file mode bits that control the kinds of access that users have to that file. They can be represented either in symbolic form or as an octal number.
|• Mode Structure:||Structure of file mode bits.|
|• Symbolic Modes:||Mnemonic representation of file mode bits.|
|• Numeric Modes:||File mode bits as octal numbers.|
|• Operator Numeric Modes:||ANDing, ORing, and setting modes octally.|
|• Directory Setuid and Setgid:||Set-user-ID and set-group-ID on directories.|