sde-reschedule-package: fixed dash compatibility

bin/sde-reschedule-package

@@ -3,7 +3,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: bin/sde-reschedule-package
-# Copyright (C) 2008 The OpenSDE Project
+# Copyright (C) 2008 - 2010 The OpenSDE Project
 #
 # More information can be found in the files COPYING and README.
 #
@@ -183,8 +183,10 @@ for x; do
 	fi
 done
 
-[ $UID -eq 0 -o "$reschedule_dry" = "yes" ] ||
-	 echo_abort 1 "You have to be superuser to proceed, sorry."
+[ -n "$UID" ] || UID=$(id -u)
+
+[ "$UID" = 0 -o "$reschedule_dry" = "yes" ] ||
+	echo_abort 1 "You have to be superuser to proceed, sorry."
 
 set -- $reschedule_packages