GNU Info

(fileutils.info)File permissions

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Enter node , (file) or (file)node

File permissions
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   Each file has a set of "permissions" that control the kinds of
access that users have to that file.  The permissions for a file are
also called its "access mode".  They can be represented either in
symbolic form or as an octal number.

Mode Structure

Structure of file permissions.

Symbolic Modes

Mnemonic permissions representation.

Numeric Modes

Permissions as octal numbers.