Gnu/coreutils/File-permissions
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27 File permissions
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. |