diff --git a/testing/btest/Scripts/diff-remove-abspath b/testing/btest/Scripts/diff-remove-abspath
new file mode 100755
index 0000000000..361ad3fa6d
--- /dev/null
+++ b/testing/btest/Scripts/diff-remove-abspath
@@ -0,0 +1,5 @@
+#! /usr/bin/env bash
+#
+# Replace absolute paths with the basename.
+
+sed 's#/\([^/]\{1,\}/\)\{1,\}\([^/]\{1,\}\)#<...>/\2#g'