don't use diff -u

diff --git a/tests/du/exclude b/tests/du/exclude
index b8bdbe0adabd4484a825a5614ab00ae052418b18..05382a81c6cd881b8821d8c9af6967365d7b7644 100755 (executable)
--- a/tests/du/exclude
+++ b/tests/du/exclude
@@ -42,6 +42,6 @@ a/x/y
 EOF
 
 cmp out exp || fail=1
-test $fail = 1 && diff -u out exp 2> /dev/null
+test $fail = 1 && diff out exp 2> /dev/null
 
 (exit $fail); exit $fail