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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. |