Specify bash, not sh.
--- CalendarServer/trunk/bin/caldavd 2007-04-17 01:53:56 UTC (rev 1489)
+++ CalendarServer/trunk/bin/caldavd 2007-04-17 01:54:40 UTC (rev 1490)
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
##
# Copyright (c) 2005-2007 Apple Inc. All rights reserved.