man uniq has all the other long option names, except for -D's
-d, --repeated
only print duplicate lines, one for each group
-D print all duplicate lines
--all-repeated[=METHOD]
like -D, but allow separating groups with an empty line;
METHOD={none(default),prepend,separate}
One needs to see (info "(coreutils) uniq invocation") to find it.
Please add it to the man page.
