doc: fix typo in sort set operations example

* doc/coreutils.texi (sort invocation): Add a missing -u
option to uniq.
Addresses https://bugs.gnu.org/35849

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index c8ca44cdda68319cb7ba3777b5e8c7328df09957..91f2e6d78053f6e842fca69787d856976824ebd8 100644 (file)
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -6755,7 +6755,7 @@ perform the equivalent of set operations on files:
 @item @code{sort file1 file2 | uniq -d}
 @tab Intersection of unsorted files
 
-@item @code{sort file1 file1 file2 | uniq}
+@item @code{sort file1 file1 file2 | uniq -u}
 @tab Difference of unsorted files
 
 @item @code{sort file1 file2 | uniq -u}