To fix these issues, make the following changes (this is a replacement
for the change listed in the Desired Action section above).

Editor's note: In the rest of this discussion <X> starts XSI shading
and </X> stops XSI shading.

Change the SYNOPSIS on P2864, L93719 from:
    XSI ls [−ACFRSacdfiklmnpqrstux1] [−H|−L] <X>[−go]</X> [file...]
to:
    XSI ls [−ikqrs] [−<X>g</X>ln<X>o</X>] [-A|-a] [-C|-m|-x|-1] \
            [-F|-p] [−H|−L] [-R|-d] [-S|-f|-t] [-c|-u] [file...]

Add to the end of the description of the -C option on P2864, L93751:
    This option disables long format output.

Add to the end of the description of the -R option on P2865, L93768:
    The use of −R with −d or -f produces unspecified results.

Change:
    with -R produces unspecified results
in the description of -d on P2865, L93778 to:
    with -R or -f produces unspecified results

Change the last sentence of the -f option description on P2865,
L93780-93781:
    This option shall turn off −l, −t, −S, −s, and −r, and shall
    turn on −a.
to:
    This option shall turn on -a.  When -f is specified, any
    occurrences of the -r, -S, and -t options shall be ignored and
    any occurrences of the -A, <X>-g</X>, -l, -n, <X>-o</X> and -s
    options may be ignored.  The use of -f with -R or -d produces
    unspecified results.

Change the -g option description on P2865, L93782 from:
    The same as -l, except that the owner shall not be written.
to:
    Turn on the -l (ell) option, but disable writing the file's

    owner name or number.  Disable the -C, -m, and -x options.
keeping XSI shading on the entire description of this option.

Change the last sentence of the -l (ell) option description on
P2865, L93788-93789 from:
    When −l (ell) is specified, −1 (one) shall be assumed.
to:
    Disable the -C, -m, and -x options.

Add to the end of the description of the -m option on P2865, L93790:
    This option disables long format output.

Change -n option description on P2865, L93791-93792 from:
    The same as −l, except that the owner’s UID and GID numbers
    shall be written, rather than the associated character strings.
to:
    Turn on the -l (ell) option, but when writing the file's owner
    or group, write the file's numeric UID or GID rather than the
    user or group name, respectively.  Disable the -C, -m, and -x
    options.

Change -o option description on P2865, L93793 from:
    The same as -l, except that the group shall not be written.
to:
    Turn on the -l (ell) option, but disable writing the file's
    group name or number.  Disable the -C, -m, and -x  options.
keeping XSI shading on the entire description of this option.

Add to the end of the -1 (one) option description on P2866, L93812:
    This option does not disable long format output.  (Long format
    output is enabled by <X>-g</X>, -l (ell), -n, and <X>-o</X>;
    and disabled by -C, -m, and -x.)

Add to the end of the description of the -x option on P2866, L93811:
    This option disables long format output.

Change the text on P2866, L93813-93815 from:
    Specifying more than one of the options in the following
    mutually-exclusive pairs shall not be considered an error: −C
    and −l (ell), −m and −l (ell), −x and −l (ell), −C and −1 (one),
    −H and −L, −c and −u, −t and −S.  The last option specified in
    each pair shall determine the output format.
to:
    If an option that enables long format output (<X>-g</X>, -l
    (ell), -n, and <X>-o</X>) is given with an option that disables
    long format output (-C, -m, and -x), this shall not be considered
    an error.  The last of these options specified shall determine
    whether long format output is written.

    If -R, -d, or -f are specified, the results of specifying these
    mutually-exclusive options are specified by the descriptions
    of these options above.  If more than one of any of the other
    options shown in the SYNOPSIS section in mutually-exclusive
    sets are given, this shall not be considered an error; the last
    option specified in each set shall determine the output.

    Note that if -t is specified, -c and -u are not only
    mutually-exclusive with each other, they are also mutually-exclusive
    with -S when determining sort order.  But even if -S is specified
    after all occurrences of -c, -t, and -u, the last use of -c or
    -u  determines the timestamp printed when producing long format
    output.

Change the rationale on P2871, L94022-94027 from:
    Generally, this volume of POSIX.1-2008 is silent about what
    Generally, this volume of POSIX.1-2008 is silent about what
    happens when options are given multiple times.  In the cases
    of −C, −l, and −1, however, it does specify the results of these
    overlapping options.  Since ls is one of the most aliased
    commands, it is important that the implementation perform
    intuitively.  For example, if the alias were:

    alias ls="ls −C"

    and the user typed ls −1 (one), single-text-column output should
    result, not an error.
to:
    This volume of POSIX.1-201x is frequently silent about what
    happens when mutually-exclusive options are specified.  Except
    for -R, -d, and -f, the ls utility is required to accept multiple
    options from each mutually-exclusive option set without treating
    them as errors and to use the behavior specified by the last
    option given in each mutually-exclusive set.  Since ls is one
    of the most aliased commands, it is important that the
    implementation perform intuitively.  For example, if the alias
    were:

    alias ls="ls −C"

    and the user typed ls −1 (one), single-text-column output should
    result, not an error.

    The -g, -l (ell), -n and -o options are not mutually-exclusive
    options.  They all enable long format output.  They work together
    to determine whether the file's owner is written (no if -g is
    present), file's group is written (no if -o is present), and
    if the file's group or owner is written whether it is written
    as the name (default) or a string representation of the UID or
    GID number (if -n is present).  The -C, -m, -x, and -1 (one)
    are mutually-exclusive options and the first three of these
    disable long format output.  The -1 (one) option does not
    directly change whether or not long format output is enabled,
    but by overriding -C, -m, and -x, it can re-enable long format
    output that had been disabled by one of these options.

Change the FUTURE DIRECTIONS section on P2872, L94057 from:
    None.
to:
    Allowing -f to ignore the -A, -g, -l, -n, -o, and -s options
    may be removed in a future version.