(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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