--- textutils.texi.orig 2003-02-28 12:18:56.655077000 -0600
+++ textutils.texi 2003-02-28 12:26:36.432005000 -0600
@@ -2513,7 +2513,30 @@
@opindex -u
@opindex --unique
@cindex unique lines, outputting
-Print only unique lines.
+Print only unique lines, i.e., print only those input lines
+that occur exactly once.
+For example, if the following lines are input
+
[EMAIL PROTECTED]
+foo
+foo
+bar
[EMAIL PROTECTED] example
+
[EMAIL PROTECTED]
+then the output of @command{uniq} is
+
[EMAIL PROTECTED]
+foo
+bar
[EMAIL PROTECTED] example
+
[EMAIL PROTECTED]
+but the output of @command{uniq -u} is
+
[EMAIL PROTECTED]
+bar
[EMAIL PROTECTED] example
@item -w @var{n}
@itemx [EMAIL PROTECTED]
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