The by-dsnd modifier designates a sort
key, in descending order and must be followed by an attribute name.
It may be used with any command that lists or selects items, such
as list or select.
Syntax
by-dsnd attr.name{by-dsnd attr.name...}
Note: If by-dsnd is provided with a command
that does not naturally sort (such as the list command),
the command is changed to its sorting counterpart (for example, list becomes sort, select becomes sselect, and so on).