fix bsd shell negation

diff --git a/t/t4022-diff-rewrite.sh b/t/t4022-diff-rewrite.sh
index 6de4acbd44589fbcf6a3f9c4ca2043c9f4e99ebe..bf996fc414d3b5ea16488a8b274973a8347b29cb 100755 (executable)
--- a/t/t4022-diff-rewrite.sh
+++ b/t/t4022-diff-rewrite.sh
@@ -8,7 +8,10 @@ test_expect_success setup '
 
        cat ../../COPYING >test &&
        git add test &&
-       tr 'a-zA-Z' 'n-za-mN-ZA-M' <../../COPYING >test
+       tr \
+         "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" \
+         "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM" \
+         <../../COPYING >test
 
 '