t4020: don't use grep -a

Solaris /usr/bin/grep doesn't understand "-a". In this case we can just include the expected output with the test, which is a better test anyway. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
gitster · Mar 13, 2008 · 53a5b44 · 53a5b44
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diff --git a/t/t4020-diff-external.sh b/t/t4020-diff-external.sh
@@ -103,7 +103,8 @@ echo NULZbetweenZwords | perl -pe 'y/Z/\000/' > file
 
 test_expect_success 'force diff with "diff"' '
 	echo >.gitattributes "file diff" &&
-	git diff | grep -a second
+	git diff >actual &&
+	test_cmp ../t4020/diff.NUL actual
 '
 
 test_done
diff --git a/t/t4020/diff.NUL b/t/t4020/diff.NUL