sort(1) -uf output inconsistent with manual page

[Kevin Martin]

>	Extreanous flags should not be added to utilites when there
>already exists a perfectly good utility to perform that function.
>	"sort -fu" caused some confusion.
>	the output from "sort -f | uniq" is self explanatory.
Of course, this only works if you want to sort and uniq by entire lines.
If only part of the line is the sort key, you're stuck with the -u flag.