bug#17022: Dosen't work properly option -u of uniq

[Александр Ботов]

Good day!

I've tried to use option -uD to discard the first repeated 
line as it written in info, but it discards the last one.

In the info said that for this purpose I should use option 
-u not by itself, but doesn't said what dose it mean. 
Could you said (and may be add to the man/info) how to use 
option -u to discard _the first_ repeated line, please?

I use Scientific Linux SL release 5.4 (Boron), Linux 
version 2.6.18-92.1.10.el5.mk8 (gcc version 4.1.2 20070626 
(Red Hat 4.1.2-14)), uniq (GNU coreutils) vesion 5.97.

Best regards, Alexander.