(coreutils.info)File permissions

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Enter node , (file) or (file)node

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.

Directory Setuid and Setgid

Set-user-ID and set-group-ID on directories.