( File Modes

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 5.2 File Modes
 A mode is any number of repetitions of
    separated by `,'.
    MODE-TYPE is an identifier composed of alphanumeric characters.
 Currently specified: `u' for user, `g' for group, `o' for other (see
 below for discussion of whether these have their POSIX meaning or are
 more loose).  Unrecognized values of MODE-TYPE are silently ignored.
    DATA consists of any data not containing `,', `\0' or `\n'.  For
 `u', `g', and `o' mode types, data consists of alphanumeric characters,
 where `r' means read, `w' means write, `x' means execute, and
 unrecognized letters are silently ignored.
    The two most obvious ways in which the mode matters are: (1) is it
 writeable?  This is used by the developer communication features, and
 is implemented even on OS/2 (and could be implemented on DOS), whose
 notion of mode is limited to a readonly bit. (2) is it executable?
 Unix CVS users need CVS to store this setting (for shell scripts and
 the like).  The current CVS implementation on unix does a little bit
 more than just maintain these two settings, but it doesn't really have
 a nice general facility to store or version control the mode, even on
 unix, much less across operating systems with diverse protection
 features.  So all the ins and outs of what the mode means across
 operating systems haven't really been worked out (e.g. should the VMS
 port use ACLs to get POSIX semantics for groups?).
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