(coreutils.info)File permissions
27 File permissions
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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.
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