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.|