coreutils: Symbolic Modes
27.2 Symbolic Modes
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“Symbolic modes” represent changes to files’ mode bits as operations on
single-character symbols. They allow you to modify either all or
selected parts of files’ mode bits, optionally based on their previous
values, and perhaps on the current ‘umask’ as well (⇒Umask and
Protection).
The format of symbolic modes is:
[ugoa...][-+=]PERMS...[,...]
where PERMS is either zero or more letters from the set ‘rwxXst’, or a
single letter from the set ‘ugo’.
The following sections describe the operators and other details of
symbolic modes.
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