(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.
 

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* 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.
 

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